diff --git a/src/dev/lupio/LupioTMR.py b/src/dev/lupio/LupioTMR.py
new file mode 100644
index 0000000..93340da
--- /dev/null
+++ b/src/dev/lupio/LupioTMR.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2021 The Regents of the University of California
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from m5.objects.Device import BasicPioDevice
+from m5.params import Param
+
+class LupioTMR(BasicPioDevice):
+    type = 'LupioTMR'
+    cxx_class='gem5::LupioTMR'
+    cxx_header = 'dev/lupio/lupio_tmr.hh'
+    pio_size = Param.Addr(0x1000, "PIO Size")
+    num_threads = Param.Int("Number of threads in the system.")
+    int_type = Param.Int("Type of interrupt.")
diff --git a/src/dev/lupio/SConscript b/src/dev/lupio/SConscript
index 1ea8a82..1eb0187 100644
--- a/src/dev/lupio/SConscript
+++ b/src/dev/lupio/SConscript
@@ -29,14 +29,17 @@
 SimObject('LupioBLK.py', tags='riscv isa')
 SimObject('LupioRNG.py', tags='riscv isa')
 SimObject('LupioRTC.py', tags='riscv isa')
+SimObject('LupioTMR.py', tags='riscv isa')
 SimObject('LupioTTY.py', tags='riscv isa')
 
 DebugFlag('LupioBLK')
 DebugFlag('LupioRNG')
 DebugFlag('LupioRTC')
+DebugFlag('LupioTMR')
 DebugFlag('LupioTTY')
 
 Source('lupio_blk.cc', tags='riscv isa')
 Source('lupio_rng.cc', tags='riscv isa')
 Source('lupio_rtc.cc', tags='riscv isa')
-Source('lupio_tty.cc', tags='riscv isa')
+Source('lupio_tmr.cc', tags='riscv isa')
+Source('lupio_tty.cc', tags='riscv isa')
\ No newline at end of file
diff --git a/src/dev/lupio/lupio_tmr.cc b/src/dev/lupio/lupio_tmr.cc
new file mode 100644
index 0000000..b440015
--- /dev/null
+++ b/src/dev/lupio/lupio_tmr.cc
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2021 The Regents of the University of California
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "dev/lupio/lupio_tmr.hh"
+
+#include "cpu/base.hh"
+#include "debug/LupioTMR.hh"
+#include "mem/packet_access.hh"
+#include "params/LupioTMR.hh"
+
+// Specific fields for CTRL
+#define LUPIO_TMR_IE    0x1
+#define LUPIO_TMR_PD    0x2
+
+// Specific fields for STAT
+#define LUPIO_TMR_EX    0x1
+
+namespace gem5
+{
+
+LupioTMR::LupioTMR(const Params &params) :
+    BasicPioDevice(params, params.pio_size),
+    system(params.system),
+    nThread(params.num_threads),
+    tmrEvent([this]{ lupioTMRCallback(); }, name()),
+    intType(params.int_type)
+{
+    DPRINTF(LupioTMR, "LupioTMR initalized\n");
+}
+
+void
+LupioTMR::updateIRQ(int level)
+{
+    if (nThread > 1) {
+        panic("This device currently does not offer SMP support\n");
+    }
+
+    auto tc = system->threads[0];
+    // post an interrupt
+    if (level) {
+        tc->getCpuPtr()->postInterrupt(tc->threadId(), intType, 0);
+    }
+    // clear the interrupt
+    else {
+        tc->getCpuPtr()->clearInterrupt(tc->threadId(), intType, 0);
+    }
+}
+
+uint64_t
+LupioTMR::lupioTMRCurrentTime()
+{
+    return curTick() / sim_clock::as_int::ns;
+}
+
+void
+LupioTMR::lupioTMRSet()
+{
+    startTime = curTick();
+    if (!tmrEvent.scheduled()) {
+        schedule(tmrEvent, (reload * sim_clock::as_int::ns) + curTick());
+    }
+}
+
+void
+LupioTMR::lupioTMRCallback()
+{
+    // Signal expiration
+    expired = true;
+    if (ie) {
+        updateIRQ(1);
+    }
+
+    // If periodic timer, reload
+    if (pd && reload) {
+        lupioTMRSet();
+    }
+}
+
+uint64_t
+LupioTMR::lupioTMRRead(uint8_t addr, int size)
+{
+    uint64_t r = 0;
+
+    switch (addr >> 2) {
+        case LUPIO_TMR_TIME:
+            r = lupioTMRCurrentTime();
+            DPRINTF(LupioTMR, "Read LUPIO_TMR_TME: %d\n", r);
+            break;
+        case LUPIO_TMR_LOAD:
+            r = reload;
+            DPRINTF(LupioTMR, "Read LUPIO_TMR_LOAD: %d\n", r);
+            break;
+        case LUPIO_TMR_STAT:
+            if (expired) {
+                r |= LUPIO_TMR_EX;
+            }
+
+            // Acknowledge expiration
+            expired = false;
+            DPRINTF(LupioTMR, "Read LUPIO_TMR_STAT: %d\n", r);
+            updateIRQ(0);
+            break;
+
+        default:
+            panic("Unexpected read to the LupioTMR device at address %#llx!",
+                    addr);
+            break;
+    }
+    return r;
+}
+
+void
+LupioTMR::lupioTMRWrite(uint8_t addr, uint64_t val64, int size)
+{
+    uint32_t val = val64;
+
+    switch (addr >> 2) {
+        case LUPIO_TMR_LOAD:
+            reload = val;
+            DPRINTF(LupioTMR, "Write LUPIO_TMR_LOAD: %d\n", reload);
+            break;
+
+        case LUPIO_TMR_CTRL:
+                    ie = val & LUPIO_TMR_IE;
+                    pd = val & LUPIO_TMR_PD;
+            DPRINTF(LupioTMR, "Write LUPIO_TMR_CTRL\n");
+
+            // Stop current timer if any
+            if (curTick() < startTime + (reload * sim_clock::as_int::ns)
+                && tmrEvent.scheduled()) {
+                deschedule(tmrEvent);
+            }
+
+            // If reload isn't 0, start a new one
+            if (reload) {
+                lupioTMRSet();
+            }
+            break;
+
+        default:
+            panic("Unexpected write to the LupioTMR device at address %#llx!",
+                    addr);
+            break;
+    }
+}
+
+Tick
+LupioTMR::read(PacketPtr pkt)
+{
+    Addr tmr_addr = pkt->getAddr() - pioAddr;
+
+    DPRINTF(LupioTMR,
+        "Read request - addr: %#x, size: %#x\n", tmr_addr, pkt->getSize());
+
+    uint64_t read_val = lupioTMRRead(tmr_addr, pkt->getSize());
+    DPRINTF(LupioTMR, "Packet Read: %#x\n", read_val);
+    pkt->setUintX(read_val, byteOrder);
+    pkt->makeResponse();
+
+    return pioDelay;
+}
+
+Tick
+LupioTMR::write(PacketPtr pkt)
+{
+    Addr tmr_addr = pkt->getAddr() - pioAddr;
+
+    DPRINTF(LupioTMR, "Write register %#x value %#x\n", tmr_addr,
+            pkt->getUintX(byteOrder));
+
+    lupioTMRWrite(tmr_addr, pkt->getUintX(byteOrder), pkt->getSize());
+    DPRINTF(LupioTMR, "Packet Write Value: %d\n", pkt->getUintX(byteOrder));
+
+    pkt->makeResponse();
+
+    return pioDelay;
+}
+} // namespace gem5
diff --git a/src/dev/lupio/lupio_tmr.hh b/src/dev/lupio/lupio_tmr.hh
new file mode 100644
index 0000000..0097f22
--- /dev/null
+++ b/src/dev/lupio/lupio_tmr.hh
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2021 The Regents of the University of California
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __DEV_LUPIO_LUPIO_TMR_HH__
+#define __DEV_LUPIO_LUPIO_TMR_HH__
+
+#include "arch/riscv/interrupts.hh"
+#include "dev/io_device.hh"
+#include "dev/platform.hh"
+#include "params/LupioTMR.hh"
+
+namespace gem5
+{
+
+/**
+ * LupioTMR:
+ * A virtual timer device which provides a real time counter, as well as a
+ * configurable timer offering periodic and one shot modes.
+ */
+
+class LupioTMR : public BasicPioDevice
+{
+  private:
+    const ByteOrder byteOrder = ByteOrder::little;
+    System *system;
+    int nThread;
+    EventFunctionWrapper tmrEvent;
+    int intType;
+
+    Tick startTime = 0;
+
+    // Register map
+    enum
+    {
+        LUPIO_TMR_TIME,
+        LUPIO_TMR_LOAD,
+        LUPIO_TMR_CTRL,
+        LUPIO_TMR_STAT,
+
+        // Max offset
+        LUPIO_TMR_MAX,
+    };
+
+    // Timer registers
+    uint64_t reload = 0;
+
+    // Control
+    bool ie = false;
+    bool pd = false;
+
+    // Status
+    bool expired = false;
+
+    /**
+     * Function to return data pertaining to the timer, such as the simulated
+     * time in ticks
+     */
+    uint64_t lupioTMRRead(const uint8_t addr, int size);
+    /**
+     * Function to launch or stop the timer depending on the load value
+     */
+    void lupioTMRWrite(const uint8_t addr, uint64_t val64, int size);
+
+    /**
+     * Return the simulated time
+     */
+    uint64_t lupioTMRCurrentTime();
+    /**
+     * Schedule the next timer event
+     */
+    void lupioTMRSet();
+    /**
+     * Process the timer's event
+     */
+    void lupioTMRCallback();
+
+    /**
+     * Post or clear timer interrupts
+     */
+    void updateIRQ(int level);
+
+  public:
+    PARAMS(LupioTMR);
+    LupioTMR(const Params &params);
+
+    /**
+     * Implement BasicPioDevice virtual functions
+     */
+    Tick read(PacketPtr pkt) override;
+    Tick write(PacketPtr pkt) override;
+};
+
+} // namespace gem5
+
+#endif // __DEV_LUPIO_LUPIO_TMR_HH_