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-rw-r--r--cpu/instructions/execution_control/ireth.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/cpu/instructions/execution_control/ireth.txt b/cpu/instructions/execution_control/ireth.txt
index 54c92c8..955e1d3 100644
--- a/cpu/instructions/execution_control/ireth.txt
+++ b/cpu/instructions/execution_control/ireth.txt
@@ -10,5 +10,7 @@ Effect:
PR is set to OPRH
Hardware interrupts are allowed again
+ Only takes effect after all other writes are complete
+
Exceptions:
`Invalid operation` if not currently executing a hardware interrupt