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-rw-r--r--chip/stm32/registers.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/chip/stm32/registers.h b/chip/stm32/registers.h
index 79c2e54934..3f519e9345 100644
--- a/chip/stm32/registers.h
+++ b/chip/stm32/registers.h
@@ -814,6 +814,7 @@ typedef volatile struct stm32_spi_regs stm32_spi_regs_t;
#define STM32_FLASH_ACR REG32(STM32_FLASH_REGS_BASE + 0x00)
#define STM32_FLASH_ACR_LATENCY (1 << 0)
+#define STM32_FLASH_ACR_PRFTEN (1 << 4)
#define STM32_FLASH_KEYR REG32(STM32_FLASH_REGS_BASE + 0x04)
#define STM32_FLASH_OPTKEYR REG32(STM32_FLASH_REGS_BASE + 0x08)
#define STM32_FLASH_SR REG32(STM32_FLASH_REGS_BASE + 0x0c)