7477 datasheet(143/354 Pages) RENESAS

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

1-126

HARDWARE

1.13 Serial I/O

[UART receive setting method]

1 Clear the Serial I/O receive interrupt enable bit (bit 5 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.7.

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

5 When using a Serial I/O receive interrupt

[1] Clear the Serial I/O receive interrupt request bit (bit 5 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 receive

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

6 In the full-duplex data communication, set transmit data in the Transmit buffer register (TB).

Table 1.13B.7 UART receive 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

Disable (Half-duplex data communication)

Enable (Full-duplex data communication)

Receive enable

Clock asynchronous

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 P1 6.

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

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