M38B79FFFP Datasheet, PDF (66/109 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b7
b0
Interrupt interval determination control register
(IIDCON: address 003116)
Interrupt interval determination circuit operating selection bit
0 : Stopped
1 : Operating
Counter sampling clock selection bit
0 : f(XIN)/128 or f(XCIN)
1 : f(XIN)/256 or f(XCIN)/2
Noise filter sampling clock selection bits (INT2)
b3b2
0 0 : Filter stop
0 1 : f(XIN)/32 or f(XCIN)
1 0 : f(XIN)/64 or f(XCIN)/2
1 1 : f(XIN)/128 or f(XCIN)/4
One-sided/both-sided edge detection selection bit
0 : One-sided edge detection
1 : Both-sided edge detection (can be used when using a noise filter)
Not used (return “0” when read)
(Do not write “1” to these bits.)
Fig. 69 Structure of interrupt interval determination control register
(When IIDCON4 = “0”)
Noise filter
sampling clock
INT2 pin
Acceptance of
interrupt
Counter sampling
clock
8-bit binary up
counter value
Interrupt interval
determination
register value
N
0
1
2
3
4
5
6
01
FE ^FF
23
N
6
FF
N
Remote control
interrupt request
6
Remote control
interrupt request
Counter overflow
interrupt request
Fig. 70 Interrupt interval determination operation example (at rising edge active)
(When IIDCON4 = “1”)
Noise filter
sampling clock
INT2 pin
01
FF
Acceptance of
interrupt
Counter sampling
clock
8-bit binary up
counter value
Interrupt interval
determination
register value
N
FE ^FF
0 ^{1 20 1}
23
01
2
01 ²
01
N
2
3
2
N
2
3
2
Remote control Remote control Remote control Remote control
interrupt request interrupt request interrupt request interrupt request
FF
FF
Counter overflow
interrupt request
Fig. 71 Interrupt interval determination operation example (at both-sided edge active)
66