7547 datasheet(86/91 Pages) RENESAS

86 / 91 page

7547 Group

Rev.1.21

Nov 15, 2006

page 86 of 89

REJ03B0156-0121

Notes on Serial I/O1

1. I/O pin function when serial I/O1 is enabled.

The pin functions of P12/SCLK1 and P13/SRDY1 are switched to as

follows according to the setting values of a serial I/O1 mode selec-

tion bit (bit 6 of serial I/O1 control register (address 1A16)) and a

serial I/O1 synchronous clock selection bit (bit 1 of serial I/O1 con-

trol register).

(1) Serial I/O1 mode selection bit

→ “1” :

Clock synchronous type serial I/O is selected.

• Setup of a serial I/O1 synchronous clock selection bit

“0” : P12 pin turns into an output pin of a synchronous clock.

“1” : P12 pin turns into an input pin of a synchronous clock.

• Setup of a SRDY1 output enable bit (SRDY)

“0” : P13 pin can be used as a normal I/O pin.

“1” : P13 pin turns into a SRDY1 output pin.

(2) Serial I/O1 mode selection bit

→ “0” :

Clock asynchronous (UART) type serial I/O is selected.

• Setup of a serial I/O1 synchronous clock selection bit

“0”: P12 pin can be used as a normal I/O pin.

“1”: P12 pin turns into an input pin of an external clock.

• When clock asynchronous (UART) type serial I/O is selected, it

functions P13 pin. It can be used as a normal I/O pin.

Note on Bus Collision Detection

When serial I/O1 is operating at half-duplex communication, set

bus collision detection interrupt to be disabled.

Notes on Serial I/O2

1. I/O pin function when serial I/O2 is enabled

The pin functions of P06/SCLK2 and P07/SRDY2 are switched to as

follows according to the setting values of a serial I/O2 mode selec-

tion bit (bit 6 of serial I/O2 control register (address 3016)) and a

serial I/O2 synchronous clock selection bit (bit 2 of serial I/O2 con-

trol register).

(1) Serial I/O2 mode selection bit

→ “1” :

Clock synchronous type serial I/O is selected.

• Setup of a serial I/O2 synchronous clock selection bit

“0” : P06 pin turns into an output pin of a synchronous clock.

“1” : P06 pin turns into an input pin of a synchronous clock.

• Setup of a SRDY2 output enable bit (SRDY)

“0” : P07 pin can be used as a normal I/O pin.

“1” : P07 pin turns into a SRDY2 output pin.

(2) Serial I/O2 mode selection bit

→ “0” :

Clock asynchronous (UART) type serial I/O is selected.

• Setup of a serial I/O2 synchronous clock selection bit

“0”: P06 pin can be used as a normal I/O pin.

“1”: P06 pin turns into an input pin of an external clock.

• When clock asynchronous (UART) type serial I/O is selected, it

functions P07 pin. It can be used as a normal I/O pin.

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