W921E400 データシートの表示（PDF） - Winbond

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W921E400

4-BIT MICROCONTROLLER

Winbond 

W921E400A/W921C400

P5IO register: (address = 011H, default data = 0H)

b3

b2

b1

b0

Reserved

Reserved

Reserved

0: Normal I/O P5.1

1: Work as the timer 2 control pin

• P6.0 to P6.3: Multi-function I/O pins (selected by P6IO register)

− Normal function I/O pins

− Special function I/O pins

P6IO register: (address = 012H, default data = 0H)

b3

b2

b1

b0

0: Normal I/O P6.0

1: Work as the data output pin of the WCLK pin

(WDATA)

0: Normal I/O P6.1

1: Work as the clock I/O pin of the WDATA pin

(WCLK)

0: Normal I/O P6.2

1: Work as the data input pin of the RCLK pin

(RDATA)

0: Normal I/O P6.3

1: Work as the clock I/O pin of the RDATA pin

(RCLK)

• PA.0 to PA.3: Normal function I/O pins only

• PB.0 to PB.3: Normal function I/O pins only

6.5.2 Pull High and Open Drain Control of I/O

Some of the above I/O ports can be controlled with pull-high resistor or open drain by programming

the special register.

All pull-high resistors of the following table are 400 KΩ in 3.0 voltage test condition. After power on

reset the following special register will all reset to '0H'.

- 15 -

Publication Release Date: July 1999

Revision A3

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