SN8P1700
8-bit micro-controller build-in 12-bit ADC
T0 INTERRUPT OPERATION
When the T0C counter occurs overflow, the T0IRQ will be set to “1” however the T0IEN is enable or disable. If the
T0IEN = 1, the trigger event will make the T0IRQ to be “1” and the system enter interrupt vector. If the T0IEN = 0, the
trigger event will make the T0IRQ to be “1” but the system will not enter interrupt vector. Users need to care for the
operation under multi-interrupt situation.
ꢃExample: T0 interrupt request setup.
B0BCLR
B0BCLR
MOV
B0MOV
MOV
FT0IEN
FT0ENB
A, #20H
T0M, A
A, #74H
T0C, A
; Disable T0 interrupt service
; Disable T0 timer
;
; Set T0 clock = Fcpu / 64
; Set T0C initial value = 74H
; Set T0 interval = 10 ms
B0MOV
B0BSET
B0BCLR
B0BSET
FT0IEN
FT0IRQ
FT0ENB
; Enable T0 interrupt service
; Clear T0 interrupt request flag
; Enable T0 timer
B0BSET
FGIE
; Enable GIE
ꢃExample: T0 interrupt service routine.
ORG
JMP
8
; Interrupt vector
INT_SERVICE
INT_SERVICE:
B0XCH
PUSH
A, ACCBUF
; B0XCH doesn’ t change C, Z flag
; Push
B0BTS1
JMP
FT0IRQ
EXIT_INT
; Check T0IRQ
; T0IRQ = 0, exit interrupt vector
B0BCLR
FT0IRQ
; Reset T0IRQ
MOV
A, #74H
B0MOV
T0C, A
; Reset T0C.
.
.
.
.
; T0 interrupt service routine
EXIT_INT:
POP
; Pop
B0XCH
A, ACCBUF
; Restore ACC value.
RETI
; Exit interrupt vector
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