微處理器 - STMicroelectronics STM8S103 - Assembly - Window watchdog(WWDG)

暫存器


Reset觸發：
1. WWDG_CR <= 0x3f
2. 更新區間不在WWDG_WR ~ WWDG_CR

main.s

    .equ PB_ODR,  0x5005
    .equ PB_IDR,  0x5006
    .equ PB_DDR,  0x5007
    .equ PB_CR1,  0x5008
    .equ PB_CR2,  0x5009
    .equ WWDG_CR, 0x50d1
    .equ WWDG_WR, 0x50d2
     
    .area data
    .area sseg
    .area home
    int main

    .area cseg
main:
    mov PB_DDR, #0x20
    mov PB_CR1, #0x20

    mov WWDG_CR, #0xff
    mov WWDG_WR, #0x7f
loop:
    ld a, PB_ODR
    xor a, #0x20
    ld PB_ODR, a
    ldw x, #5000 
d0:
    decw x
    tnzw x
    jrne d0
    jp loop

觀察LED的變化