7477 datasheet(139/354 Pages) RENESAS

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

1-122

HARDWARE

1.13 Serial I/O

[UART transmit setting method]

1 Clear the Serial I/O transmit interrupt enable bit (bit 6 of Interrupt control register 1) to “0.”

2 When selecting the internal clock, set the BRG value.

3 Set the Serial I/O control register according to Table 1.13B.5.

4 Set the data format according to Table 1.13B.6.

5 When using a Serial I/O transmit interrupt

[1] Clear the Serial I/O transmit interrupt request bit (bit 6 of Interrupt request register 1) to “0.”

Note: When the ordinary port is switched over to the Serial I/O port, the Serial I/O transmit

interrupt request may be set to “1.” Clear the Serial I/O transmit interrupt request bit

to “0” after one instruction or more after switching the ordinary port over to the Serial

I/O port.

[2] Set the Serial I/O transmit interrupt enable bit to “1.”

6 Write transmit data into the Transmit buffer register.

Table 1.13B.5 UART transmit setting

Item

f (XIN)/4

f (XIN)/16

BRG output divided by 16

External clock input divided by 16

Transmit buffer empty

When the transmit shift operation is completed

Transmit enable

Disable (Half-duplex data communication)

Enable (Full-duplex data communication)

Clock asynchronization

P14 to P17 function as Serial I/O pins (Note 3)

Serial I/O control register

(SIOCON: Address 00E216)

bit

setting value

(Note 2)

Notes 1: f(XCIN)/4 (setting value : 0), f(XCIN)/16 (setting value : 1) can be selected in the 7478 Group.

2: When the UART is selected, this bit does not function.

3: When the internal clock is selected, the P16/SCLK pin can be used as port P16.

BRG count source selection

(Note 1)

Synchronous clock selection

__________

SRDY

signal output selection

Transmit interrupt request selection

Transmit enable selection

Receive enable selection

Clock asynchronous selection

Serial I/O enable selection

Table 1.13B.6 Set value of UART control register

Serial data transfer format

1ST-8DATA-1SP

1ST-7DATA-1SP

1ST-8DATA-1PA-1SP

1ST-7DATA-1PA-1SP

1ST-8DATA-2SP

1ST-7DATA-2SP

1ST-8DATA-1PA-2SP

1ST-7DATA-1PA-2SP

UART control register (UARTCON: Address 00E316)

–

Selection

(Note)

Selection

(Note)

Note: 0: Even parity

1: Odd parity

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