upd17072 Renesas Electronics Corporation., upd17072 Datasheet - Page 75
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upd17072
Manufacturer Part Number
upd17072
Description
4-bit Single-chip Microcontroller With Hardware For Digital Tuning System
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD17072.pdf
(226 pages)
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(1) When one type of interrupt (e.g., rising edge of INT pin) is used
INTE
INT pin
IRQ flag
IP flag
INTE
INT pin
IRQ flag
IP flag
INTE
INT pin
IRQ flag
IP flag
Instruction
Instruction
Instruction
(b) When there is interrupt pending time by interrupt enable flag
(a) When there is no time to mask interrupt by interrupt enable flag (IPxxx)
<1>
<2>
(normal operation)
1 instruction cycle
If an ordinary instruction which is not “MOVT” or does not satisfy the skip condition
is executed when interrupt is accepted
If “MOVT” or an instruction that satisfies the skip condition is executed when
interrupt is accepted
53.3 s
EI
EI
EI
MOV
WR, #0001B
MOV
WR, #0001B
Figure 11-8. Interrupt Accepting Timing Chart (1/2)
Interrupt pending period
POKE
INTPM1, WR
POKE
INTPM1, WR
Interrupt enable period
MOV
WR, #0001B
Interrupt enable period
MOVT DBF,@AR
skip instruction
instruction
POKE
INTPM1, WR
Ordinary
Interrupt accepted
Interrupt
Interrupt accepted
Interrupt
cycle
cycle
Interrupt accepted
Interrupt
service routine
service routine
cycle
Interrupt
Interrupt
PD17072,17073
service routine
Interrupt
75
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