7906 datasheet(268/531 Pages) RENESAS

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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-27

11.3 Clock synchronous serial I/O mode

D0 D1 D2 D3

D4 D5 D6 D7 D0 D1 D2 D3 D4

D0 D1 D2 D3 D4 D5 D6 D7

TCLK

CLKi

TENDi

TxDi

Transfer clock

Transmit enable bit

Transmit buffer

empty flag

Transmit register

empty flag

UARTi transmit

interrupt request bit

Data is set in UARTi transmit buffer register.

UARTi transmit register

←UARTi transmit buffer register.

Stopped because transmit enable bit = “0.”

TENDi: Next transmit conditions are examined when this signal level is “H.”

(TENDi is an internal signal. Accordingly, it cannot be read from the external.)

Tc = TCLK = 2(n+1) /fi

fi: BRGi count source frequency

n: Value set in BRGi

Cleared to “0” when interrupt request is accepted or cleared to “0” by software.

The above timing diagram applies

when the following conditions are

satisfied:

q Internal clock selected

q CTS function not selected

q CLK polarity select bit = 0

D0 D1

D2 D3 D4 D5

D6 D7

D0 D1

D2 D3 D4 D5

D6 D7

D0 D1 D2 D3

D4 D5 D6

CTSi

CLKi

TENDi

TxDi

Transfer clock

Transmit enable bit

Transmit buffer

empty flag

Transmit register

empty flag

UARTi transmit

interrupt request bit

TCLK

Data is set in UARTi transmit buffer register.

UARTi transmit register

← UARTi transmit buffer register.

Stopped because CTSi = “H.”

Stopped because transmit enable bit = “0.”

TENDi: Next transmit conditions are examined when this signal level is “H.”

(TENDi is an internal signal. Accordingly, it cannot be read from the external.)

Tc = TCLK = 2(n+1) /fi

fi: BRGi count source frequency

n: Value set in BRGi

Cleared to “0” when interrupt request is accepted or cleared to “0” by software.

The above timing diagram applies when

the following conditions are satisfied:

q Internal clock selected

q CTS function selected

q CLK polarity select bit = 0

Fig. 11.3.6 Example of transmit timing (when internal clock and CTS function selected)

Fig. 11.3.7 Example of transmit timing (when internal clock selected and CTS function not selected)

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