3851 datasheet(10/55 Pages) RENESAS

Part #	3851

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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10 / 55 page

9

3851 Group

(Built-in 16 KB ROM)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Fig. 7 Port block diagram (1)

(1) Ports P0, P1

Direction

register

Data bus

Port latch

(2) Port P20

Port XC switch bit

Oscillator

Port P21

Data bus

Port latch

Direction

register

Port XC switch bit

(3) Port P21

Port XC switch bit

Data bus

Port latch

Direction

register

Sub-clock generating circuit input

(4) Port P22

Data bus

Port latch

Direction

register

SDA output

I C-BUS interface enable bit

SDA/SCL pin selection bit

SDA input

2

(5) Port P23

Data bus

Port latch

Direction

register

SCL output

I C-BUS interface enable bit

SDA/SCL pin selection bit

SCL input

2

(6) Port P24

Data bus

Port latch

Direction

register

SDA output

Serial I/O enable bit

Receive enable bit

I C-BUS interface enable bit

SDA/SCL pin selection bit

2

SDA input

Serial I/O input

(7) Port P25

Data bus

Port latch

Direction

register

SCL output

I C bus interface enable bit

SDA/SCL pin selection bit

Serial I/O enable bit

Transmit enable bit

2

SCL input

Serial I/O output

P-channel output disable bit

(8) Port P26

Data bus

Port latch

Direction

register

Serial clock output

Serial I/O mode selection bit

Serial I/O enable bit

Serial I/O clock selection bit

External clock input

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3851 Datasheet(PDF) 10 Page - Renesas Technology Corp

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