Z86L79 Datasheet, PDF (29/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Z86L79/80
Low-Voltage Microcontroller
FUNCTIONAL DESCRIPTION (Continued)
Port pins configured as outputs are ignored as an SMR2
recover source. For example, if NAND of P23-P20 is se-
lected as the recover source and P20 is configured as out-
Zilog
put, then P20 is ignored as a recover source. The effective
recover source in this case is NAND of P23-P21.
CTR1 D5,D4
P31
Glitch
MUX
Filter
P20
Edge
Detector
Pos Edge
Neg Edge
CTR1 D6
CTR1 D3,D2
Figure 18. Glitch Filter Circuitry
Z8 Data Bus
Pos Edge
Neg Edge
HI8
CTR0 D4, D3
SCLK
Clock
Select
Clock
8-Bit
Counter T8
CTR0 D2
LO8
IRQ4
CTR0 D1
T8_OUT
Z8 Data Bus
TC8H
TC8L
Figure 19. 8-Bit Counter/Timer Circuits
3-29
PRELIMINARY
DS97LVO0601