Microchip Technology MA330026 Data Sheet

dsPIC33FJ16(GP/MC)101/102 AND dsPIC33FJ32(GP/MC)101/102/104

DS70000652F-page 184

 2011-2014 Microchip Technology Inc.

EXAMPLE 15-1:

ASSEMBLY CODE FOR WRITE-PROTECTED REGISTER UNLOCK AND FAULT
CLEARING SEQUENCE

EXAMPLE 15-2:

C CODE FOR WRITE-PROTECTED REGISTER UNLOCK AND FAULT CLEARING
SEQUENCE

; FLTA1 pin must be pulled high externally in order to clear and disable the Fault

; Writing to P1FLTBCON register requires unlock sequence

mov #0xabcd,w10

; Load first unlock key to w10 register

mov #0x4321,w11

; Load second unlock key to w11 register

mov #0x0000,w0

; Load desired value of P1FLTACON register in w0

mov w10, PWM1KEY

; Write first unlock key to PWM1KEY register

mov w11, PWM1KEY

; Write second unlock key to PWM1KEY register

mov w0,P1FLTACON

; Write desired value to P1FLTACON register

; FLTB1 pin must be pulled high externally in order to clear and disable the Fault

; Writing to P1FLTBCON register requires unlock sequence

mov #0xabcd,w10

; Load first unlock key to w10 register

mov #0x4321,w11

; Load second unlock key to w11 register

mov #0x0000,w0

; Load desired value of P1FLTBCON register in w0

mov w10, PWM1KEY

; Write first unlock key to PWM1KEY register

mov w11, PWM1KEY

; Write second unlock key to PWM1KEY register

mov w0,P1FLTBCON

; Write desired value to P1FLTBCON register

; Enable all PWMs using PWM1CON1 register

; Writing to PWM1CON1 register requires unlock sequence

mov #0xabcd,w10

; Load first unlock key to w10 register

mov #0x4321,w11

; Load second unlock key to w11 register

mov #0x0077,w0

; Load desired value of PWM1CON1 register in w0

mov w10, PWM1KEY

; Write first unlock key to PWM1KEY register

mov w11, PWM1KEY

; Write second unlock key to PWM1KEY register

mov w0,PWM1CON1

; Write desired value to PWM1CON1 register

// FLTA1 pin must be pulled high externally in order to clear and disable the Fault

// Writing to P1FLTACON register requires unlock sequence

// Use builtin function to write 0x0000 to P1FLTACON register

__builtin_write_PWMSFR(&P1FLTACON, 0x0000, &PWM1KEY);

// FLTB1 pin must be pulled high externally in order to clear and disable the Fault

// Writing to P1FLTBCON register requires unlock sequence

// Use builtin function to write 0x0000 to P1FLTBCON register

__builtin_write_PWMSFR(&P1FLTBCON, 0x0000, &PWM1KEY);

// Enable all PWMs using PWM1CON1 register

// Writing to PWM1CON1 register requires unlock sequence

// Use builtin function to write 0x0077 to PWM1CON1 register

__builtin_write_PWMSFR(&PWM1CON1, 0x0077, &PWM1KEY);