M38002M4 Datasheet, PDF (31/173 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

(1) Ports P0, P1, P2, P3, P40, P41, P56, P57, P6, P7
Direction register
Data bus
Port latch
HARDWARE
FUNCTIONAL DESCRIPTION
(2) Ports P42, P43, P50 – P53
Direction register
Data bus
Port latch
Interrupt input
(3) Port P44
Serial I/O enable bit
Receive enable bit
Direction register
Data bus
Port latch
Serial I/O input
(5) Port P46
Serial I/O
synchronous clock selection bit
Serial I/O enable bit
Serial I/O mode selection bit
Serial I/O enable bit
Direction register
Data bus
Port latch
Serial I/O clock output
Serial I/O
external
clock input
(7) Ports P54, P55
Direction register
Data bus
Port latch
Pulse output mode
Timer output
Counter input
Interrupt input
Fig. 12 Port block diagram (single-chip mode)
(4) Port P45
P45/TXD P-channel output disable bit
Serial I/O enable bit
Transmit enable bit
Direction register
Data bus
Port latch
Serial I/O output
(6) Port P47
Serial I/O mode selection bit
Serial I/O enable bit
SRDY output enable bit
Direction register
Data bus
Port latch
Serial I/O ready output
3800 GROUP USER’S MANUAL
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