3802 datasheet(13/52 Pages) RENESAS

13 / 52 page

MITSUBISHI MICROCOMPUTERS

3802 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Fig. 4 Port block diagram (single-chip mode) (1)

(1) Ports P0, P1, P2, P32–P37

Direction register

Data bus

Port latch

(2) Ports P30, P31

(3) Ports P40–P43, P57

Direction register

Data bus

Port latch

Serial I/O1 input

Serial I/O1 enable bit

Receive enable bit

(4) Port P44

(5) Port P45

(6) Port P46

Direction register

Data bus

Port latch

Serial I/O1 ready output

Serial I/O1 enable bit

SRDY1 output enable bit

Serial I/O1 mode selection bit

(7) Port P47

(8) Port P50

Serial I/O2 input

Direction register

Data bus

Port latch

D–A conversion output

DA1 output enable bit (P30)

DA2 output enable bit (P31)

Direction register

Data bus

Port latch

Interrupt input

Direction register

Data bus

Port latch

Serial I/O1 output

Serial I/O1 enable bit

Transmit enable bit

P45/TXD P-channel output disable bit

Direction register

Data bus

Port latch

Serial I/O1 clock output

Serial I/O1 mode selection bit

Serial I/O1 enable bit

Serial I/O1 synchronous

clock selection bit

Serial I/O1

external

clock input

Direction register

Data bus

Port latch

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