7721 datasheet(240/577 Pages) RENESAS

tên linh kiện	7721

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

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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.

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