7540 datasheet(199/366 Pages) RENESAS

199 / 366 page

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REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.7 Serial I/O2

Fig. 2.7.7 Setting method for serial I/O2

2.7.3 Application example of serial I/O2

(1) Serial I/O2 setting method

Figure 2.7.7 and Figure 2.7.8 show the setting method for the serial I/O2.

b7b0

Port P1 direction register (P1D) [Address 0316]

b7b0

P12/SCLK2 pin (Note 1)

P13/SDATA2 pin (Notes 2, 3)

Interrupt control register 2 (ICON2) [Address 3F16]

Serial I/O2 interrupt disabled

Internal synchronous clock selected (set in internal clock selected)

b2b1b0

0 0 0: f(XIN)/8

0 0 1: f(XIN)/16

0 1 0: f(XIN)/32

0 1 1: f(XIN)/64

1 1 0: f(XIN)/128

1 1 1: f(XIN)/256

SDATA2 pin selected

0: I/O port/SDATA2 input (at receive)

1: SDATA2 output (at transmit)

Transfer direction selected

0: LSB first

1: MSB first

SCLK2 pin selected

0: External clock (SCLK2 is input)

1: Internal clock (SCLK2 is outpu)

Serial I/O2 control register (SIO2CON) [Address 3016]

Process 3: Set serial I/O2 control register.

Process 1: Disable serial I/O2 transmit/receive interrupt.

Process 4: In order not to execute the no requested interrupt processing, set “0” (no requested)

to the serial I/O2 interrupt request bit.

Interrupt request register 2 (IREQ2) [Address 3D16]

No serial I/O2 interrupt request issued

Notes 1: When an external clock input is selected, set P12/SCLK2 pin to the input mode.

2: When P13/SDATA2 pin is used as the P13 pin, set this bit to “0”.

3: When this bit is set to “0” at transmit and the internal clock is selected for SCLK2,

the SDATA2 pin is in a high impedance state after the data transfer is completed.

Process 2: Set port P1 according to the usage condition.

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