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-rw-r--r--ports/stm32/boards/PYBD_SF2/mpconfigboard.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/ports/stm32/boards/PYBD_SF2/mpconfigboard.h b/ports/stm32/boards/PYBD_SF2/mpconfigboard.h
index 4ce17abd8..757dacf9a 100644
--- a/ports/stm32/boards/PYBD_SF2/mpconfigboard.h
+++ b/ports/stm32/boards/PYBD_SF2/mpconfigboard.h
@@ -56,8 +56,8 @@ void board_sleep(int value);
#define MICROPY_HW_FLASH_LATENCY (FLASH_LATENCY_3)
// There is an external 32kHz oscillator
-#define RTC_ASYNCH_PREDIV (0)
-#define RTC_SYNCH_PREDIV (0x7fff)
+#define RTC_ASYNCH_PREDIV (3)
+#define RTC_SYNCH_PREDIV (0x1fff)
#define MICROPY_HW_RTC_USE_BYPASS (1)
#define MICROPY_HW_RTC_USE_US (1)
#define MICROPY_HW_RTC_USE_CALOUT (1)