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-rw-r--r--os/ports/RVCT/ARMCMx/chcoreasm_v6m.s2
1 files changed, 1 insertions, 1 deletions
diff --git a/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s b/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s
index 725189996..a20327c5d 100644
--- a/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s
+++ b/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s
@@ -113,7 +113,7 @@ _port_switch_from_isr PROC
ldr r2, =SCB_ICSR
movs r3, #128
#if CORTEX_ALTERNATE_SWITCH
- lsls r3, r3, #20
+ lsls r3, r3, #21
str r3, [r2, #0]
cpsie i
#else