7721 datasheet(240/577 Pages) RENESAS

No. de pieza	7721

Descripción Electrónicos	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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7721 Group User’s Manual

11–37

SERIAL I/O

11.4 Clock asynchronous serial I/O (UART) mode

Fig. 11.4.5 Detection of transmit completion

[When not using interrupts]

[When using interrupts]

UARTi transmit interrupt

UART0 transmit interrupt control register (Address 7116)

UART1 transmit interrupt control register (Address 7316)

Interrupt request bit

Checking start of transmission

UART0 transmit/receive control register 0 (Address 3416)

UART1 transmit/receive control register 0 (Address 3C16)

Checking completion of transmission.

Transmit register empty flag

0: During transmission

1: Transmission completed

Processing at completion of transmission

No interrupt requested

Interrupt requested

(Transmission has started.)

A UARTi transmit interrupt request

occurs when transmission starts.

Note : This figure shows the bits and registers required

for processing.

Refer to “Figures 11.4.6 to 11.4.8” for the

change of flag state and the occurrence timing

of an interrupt request.

7721 Datasheet(PDF) 240 Page - Renesas Technology Corp