diff --git a/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests.zig b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests.zig
index 9fa15b2d..0be9dfbc 100644
--- a/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests.zig
+++ b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests.zig
@@ -16,6 +16,7 @@ const c = @cImport({
     @cInclude("comparison_tests/i2c.pio.h");
     @cInclude("comparison_tests/irq.pio.h");
     @cInclude("comparison_tests/manchester_encoding.pio.h");
+    @cInclude("comparison_tests/movrx.pio.h");
     @cInclude("comparison_tests/nec_carrier_burst.pio.h");
     @cInclude("comparison_tests/nec_carrier_control.pio.h");
     @cInclude("comparison_tests/nec_receive.pio.h");
@@ -107,6 +108,11 @@ test "pio.comparison.manchester_encoding" {
     try pio_comparison(@embedFile("comparison_tests/manchester_encoding.pio"));
 }
 
+test "pio.comparison.movrx" {
+    @setEvalBranchQuota(11000);
+    try pio_comparison_cpu(.RP2350, @embedFile("comparison_tests/movrx.pio"));
+}
+
 test "pio.comparison.nec_carrier_burst" {
     @setEvalBranchQuota(6000);
     try pio_comparison(@embedFile("comparison_tests/nec_carrier_burst.pio"));
diff --git a/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio
new file mode 100644
index 00000000..fdd12de4
--- /dev/null
+++ b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio
@@ -0,0 +1,14 @@
+.program movrx
+
+.wrap_target
+    mov rxfifoy, isr
+    mov rxfifo0, isr
+    mov rxfifo1, isr
+    mov rxfifo2, isr
+    mov rxfifo3, isr
+;    mov osr, rxfifoy
+;    mov osr, rxfifo0
+;    mov osr, rxfifo1
+;    mov osr, rxfifo2
+;    mov osr, rxfifo3
+.wrap
diff --git a/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio.h b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio.h
new file mode 100644
index 00000000..40b5c562
--- /dev/null
+++ b/port/raspberrypi/rp2xxx/src/hal/pio/assembler/comparison_tests/movrx.pio.h
@@ -0,0 +1,16 @@
+#pragma once
+
+static const uint16_t movrx_program_instructions[] = {
+    // 0b1000_ssss_0001_yiii
+    0x8018, // mov rxfifoy, isr
+    0x8010, // mov rxfifo0, isr
+    0x8011, // mov rxfifo1, isr
+    0x8012, // mov rxfifo2, isr
+    0x8013, // mov rxfifo3, isr
+            // 0b1000_ssss_1001_yiii
+            // 0x8098, // mov osr, rxfifoy
+            // 0x8090, // mov osr, rxfifo0
+            // 0x8091, // mov osr, rxfifo1
+            // 0x8092, // mov osr, rxfifo2
+            // 0x8093, // mov osr, rxfifo3
+};