UPD784021 datasheet(39/92 Pages) RENESAS

39 / 92 page

mPD784020, 784021

8.8

SERIAL INTERFACE

Three independent serial interface channels are incorporated.

• Asynchronous serial interface (UART)/three-wire serial I/O (IOE) ¥ 2

• Synchronous serial interface (CSI) ¥ 1

• Three-wire serial I/O (IOE)

• Serial bus interface (SBI)

So, communication with points external to the system and local communication within the system can be performed

at the same time. (See Fig. 8-9.)

Fig. 8-9 Example Serial Interfaces

Note Handshake line

SB0

SCK

(a) UART + SBI

RS-232-C

driver/

receiver

Port

RxD

TxD

SB0

SCK0

PD75402A (slave)

PD75328 (slave)

PD784021 (master)

PD4711A

VDD

SB0

LCD

SCK

(UART)

(SBI)

Port

RxD2

TxD2

PD4711A

(UART)

RS-232-C

driver/

receiver

SCK

Port

INT

(b) UART + Three-wire serial I/O

[Three-wire serial I/O]

RS-232-C

driver/

receiver

Port

RxD

TxD

SO0

SI0

SCK0

INTPm

Port

SO1

SI1

INTPn

SCK1

Port

Note

PD75108 (slave)

PD784021 (master)

PD4711A

SCK

Port

INT

Note

PD78014 (slave)

(UART)

UPD784021 Datasheet(PDF) 39 Page - Renesas Technology Corp

UPD784021 Datasheet(HTML) 39 Page - Renesas Technology Corp

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