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Diffstat (limited to 'sw/z80/drivers/include/usart.h')
-rw-r--r--sw/z80/drivers/include/usart.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/sw/z80/drivers/include/usart.h b/sw/z80/drivers/include/usart.h
index bb06aab..fdc01e2 100644
--- a/sw/z80/drivers/include/usart.h
+++ b/sw/z80/drivers/include/usart.h
@@ -48,8 +48,8 @@
#define USART_AUTOFLOW_CTS 2
#define USART_AUTOFLOW_OFF 0
-typedef unsigned int uint;
-typedef uint8_t register_t;
+typedef unsigned int uint;
+typedef volatile uint8_t register_t;
/* stuctures for usart registers */
struct IER