W921E843A Просмотр технического описания (PDF) - Winbond

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W921E843A

4-BIT MICROCONTROLLER

Winbond 

W921E840A/W921C840

• PA, PB, PC, PD:

PABCDPH register: (address = 007H, default data = 0H)

b3

b2

b1

b0

0: PA (4 pins) without pull-high resistor

1: PA (4 pins) with pull-high resistor

0: PB (4 pins) without pull-high resistor

1: PB (4 pins) with pull-high resistor

0: PC (3 pins) without pull-high resistor

1: PC (3 pins) with pull-high resistor

0: PD (2 pins) without pull-high resistor

1: PD (2 pins) with pull-high resistor

PABCDTP register: (address = 008H, default data = 0H)

b3

b2

b1

b0

0: PA (4 pins) work as CMOS type

1: PA (4 pins) work as open-drain type

0: PB (4 pins) work as CMOS type

1: PB (4 pins) work as open-drain type

0: PC (3 pins) work as CMOS type

1: PC (3 pins) work as open-drain type

0: PD (2 pins) work as CMOS type

1: PD (2 pins) work as open-drain type

• P2:

P2TP register: (address = 00DH, default data = 0H)

b3

b2

b1

b0

Reserved

Reserved

6.6 Serial Port

0: P2 (4 pins) work as CMOS type

1: P2 (4 pins) work as open-drain type

0: PC.3 works as normal I/O port (CMOS type)

1: PC.3 works as 32.768KHz output buffer

(open-drain type) only for W921E841A,

843A, 844A

The W921E840A/W921C840 has a clock-synchronous serial interface which transmits and receives

8-bit data as default. User can program the P6IO register to select port P6 as the serial port. The

serial transmitter/receiver function can be operated with multi-nibble function and the LSB of every

nibble is transmitted/received first.

The serial transmitted/received data are come from or are stored into the serial buffer registers

(address 050H to 14EH); how many nibbles will be transmitted/received is decided by the serial MSB

nibble register (SRMNR, address = 00AH) and serial LSB nibble register (SRLNR, address = 009H).

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Publication Release Date: July 1999

Revision A3

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