7477 datasheet(126/354 Pages) RENESAS

Part #	7477

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

PDF	354 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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126 / 354 page

HARDWARE

1-109

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

1.13 Serial I/O

Fig. 1.13B.3 Transmit timing chart of clock synchronous Serial I/O

TXD pin

SRDY pin

Synchronous clock,

BRG divided by 4, or

external clock

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”.

7477 Datasheet(PDF) 126 Page - Renesas Technology Corp