7906 datasheet(266/531 Pages) RENESAS

266 / 531 page

SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-25

11.3 Clock synchronous serial I/O mode

Fig. 11.3.4 Detect operation 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: Transmission is in progress.

1: Transmission is completed.

Processing at completion of transmission

0: No interrupt requested

1: Interrupt requested

(Transmission has started.)

A UARTi transmit interrupt request

occurs when the transmission starts.

Note: This figure shows the bits and registers required

for processing.

See Figures 11.3.6 and 11.3.7 for the change

of flag state and the occurrence timing of an

interrupt request.

[When not using interrupts]

[When using interrupts]

A UARTi transmit interrupt request occurs

when the transbission starts (when the

UARTi transmit buffer register becomes

empty).

UARTi transmit interrupt

Note:

UART0 transmit buffer register (Address 3216)

UART1 transmit buffer register (Address 3A16)

Writing of next transmit data

Transmit data is set.

UART0 transmit/receive control register 1 (Address 3516)

UART1 transmit/receive control register 1 (Address 3D16)

Transmit buffer empty flag

0: Data is present in transmit buffer register.

1: No data is present in transmit buffer register.

(Writing of next transmit data is possible.)

Checking state of UARTi transmit buffer register

This figure shows the bits and registers required

for processing.

See Figures 11.3.6 and 11.3.7 for the change of

flag state and the occurrence timing of an interrupt

request.

Fig. 11.3.3 Write operation of data after transmission start

7906 Datasheet(PDF) 266 Page - Renesas Technology Corp

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