7477 datasheet(129/361 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

BRG count source selection

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

f (XIN)/4 or f(XCIN)/4

f (XIN)/16 or f(XCIN)/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 2)

Serial I/O control register

(SIOCON: Address 00E216)

bit

setting value

(Note 1)

Notes 1: When the UART is selected, this bit does not function.

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

Table 1.13B.6 Set value of UART control register

Serial I/O 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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