7477 datasheet(127/354 Pages) RENESAS

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HARDWARE

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

1.13 Serial I/O

[Clock synchronous Serial I/O transmit setting method]

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

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

3Set the Serial I/O control register according to Table 1.13B.1.

4When 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 bit 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.”

5Write transmit data into the Transmit buffer register (TB: address 00E016).

Note: When the external clock is selected, perform a write operation while the synchronous clock

is at “H.”

Table 1.13B.1 Clock synchronous Serial I/O transmit setting

Item

Serial I/O control register

(SIOCON: Address 00E216)

Bit

Setting value

1(Note 2)

BRG count source selection

(Note 1)

Synchronous clock selection

__________

SRDY

signal output selection

Transmit interrupt request selection

f(XIN)/4

f(XIN)/16

BRG output divided by 4

External clock input

Ordinary port

__________

SRDY

signal output

Transmit buffer empty

When the transmit shift operation is completed

Transmit enable

Disable (half-duplex data communication)

Enable (full-duplex data communication)

Clock synchronous

P14 to P17 function as serial I/O pins

Serial I/O enable selection

Clock synchronous selection

Receive enable selection

Transmit enable selection

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

2: When the external clock is selected, write “1” in bit 4 (transmit enable bit) while the synchronous

clock is at “H.”

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