7477 datasheet(138/354 Pages) RENESAS

Part #	7477

Description	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	354 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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138 / 354 page

1-121

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.13 Serial I/O

Fig. 1.13B.10 Transmit timing chart of UART

TXD pin

Synchronous clock,

BRG output divided by 16, or

external clock divided by 16

Write signal to

Transmit buffer register

: • Clearing by writing “0” to the transmit interrupt request bit.

• Clearing by accepting the transmit interrupt.

Transmit buffer empty flag

Transmit shift completion flag

Transmit interrupt enable bit

Transmit interrupt request bit

: When interrupt request generation is selected, when the Transmit buffer register

becomes empty by clearing the transmit interrupt source selection bit to “0”.

: When interrupt request generation is selected, when the shift operation of the

Transmit shift register is completed by setting the transmit interrupt source selection bit to “1”.

Serial I/O not used

7477 Datasheet(PDF) 138 Page - Renesas Technology Corp