UPD17073 NEC, UPD17073 Datasheet - Page 76
UPD17073
Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet
1.UPD17073.pdf
(226 pages)
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Part Number:
UPD17073GB-572-1A7-A
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INTE
INT pin
IRQ flag
Basic timer 1
IRQBTM1 flag
IP flag
IPBTM1 flag
INTE
INT pin
IRQ flag
Basic timer 1
IRQBTM1 flag
IP flag
IPBTM1 flag
Instruction
Instruction
76
(2) When two or more interrupts are used (e.g., INT pin and basic timer 1)
Note
(a) Hardware priority
(b) Software priority
Because the level of the interrupt stack is 1, multiplexed interrupt cannot be performed.
MOV
WR, #0011B
MOV
WR, #0010B
POKE
INTPM1, WR
POKE
INTPM1, WR
Basic timer 1 interrupt pending period
INT pin interrupt pending period
Figure 11-8. Interrupt Accepting Timing Chart (2/2)
EI
EI
INT pin interrupt accepted
Basic timer 1 interrupt accepted
INT pin interrupt pending period
Interrupt
cycle
Basic timer 1 interrupt pending period
Interrupt
cycle
INT pin interrupt service routine
Basic timer 1 interrupt service routine
MOV
WR, #0011B
EI
POKE
INTPM1, WR
RETI
Note
Basic timer 1 interrupt accepted
Interrupt
cycle
EI
RETI
Basic timer 1
interrupt service
PD17072,17073
Note
INT pin interrupt
accepted
Interrupt
cycle
INT pin interrupt
service
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