7480 datasheet(138/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-121

1.14 Serial I/O

HARDWARE

(4)

Setting of Clock Synchronous Serial I/O

Figures 1.14.13 and 1.14.14 show the setting of clock synchronous serial I/O.

Figure 1.14.13 Setting of Clock Synchronous Serial I/O (1)

Serial I/O receive interrupt disabled

Serial I/O transmit interrupt disabled

Procedure 2 Disabling serial I/O transmit/receive interrupt

Interrupt control register 1 (ICON1) [Address 00FE16]

Transmit operation stop and initialized

Receive operation stop and initialized

Procedure 1 Stop and initialization of serial I/O operation

Serial I/O control register (SIOCON) [Address 00E216]

BRG count source selection

(valid only when BRG output/4 is selected as synchronous clock)

0: f(XIN)/4

1: f(XIN)/16

Notes 1: When the following conditions are satisfied, set the transmit enable bit

in addition to the receive enable bit and SRDY output enable bit to ‘1’.

• Half-duplex communication is performed

• External clock is selected as synchronous clock for receive side

• SRDY output is performed.

2: Keep SCLK pin input HIGH when writing transmit enable bit to ‘1’

to select the external clock input as the synchronous clock.

Baud rate value is set

Procedure 3 Setting baud rate generator when BRG output/4 is selected as synchronous clock

Baud rate generator (BRG) [Address 00E416]

Procedure 4 Setting serial I/O control register

Serial I/O control register (SIOCON) [Address 00E216]

Serial I/O synchronous clock selection

0: BRG output/ 4

1: External clock input

SRDY output enable selection

0: P17/SRDY pin is operated as normal I/O pin

1: P17/SRDY pin is operated as SRDY pin (Note 1)

Transmit interrupt source selection (valid only when transmitting)

0: when transmit buffer is empty

1: when transmit shift operation is completed

Transmit enable selection

0: transmit disabled

1: transmit enabled (Note 2)

Receive enable selection

0: receive disabled

1: receive enabled

Clock synchronous serial I/O selected

Serial I/O enabled (P14–P17 are operated as serial I/O pin)

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