M38197MA Datasheet, PDF (12/60 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(1) Ports P0, P10, P11
Shift signal from previous stage
S/D switch register
Blanking signal
for key-scan
Data bus
Local data bus
Dimmer signal
(Note)
Port latch
(2) Ports P12–P17
Shift signal to next stage
Shift signal from previous stage
Dimmer signal
(Note)
Data bus
Port latch
V
VEE
V
(3) Ports P20–P23
Shift signal to next stage
Shift signal from previous stage
D/P switch register
Data bus
Dimmer signal
(Note)
Port latch
Blanking signal
for key-scan
Shift signal to next stage
(4) Ports P24–P27, P41, P60, PB3
Data bus
Direction
register
Port latch
VEE
V
VEE
V : High-breakdown-voltage P-channel transistor
Note: The dimmer signal sets the Toff timing.
Fig. UA-2 Port block diagram (1)
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