7540 datasheet(163/366 Pages) RENESAS

163 / 366 page

2-87

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.5 Timer Y and timer Z

Fig. 2.5.30 Setting method for programmable one-shot generation mode (2)

Prescaler Z (PREZ) [Address 2516] (Note 2)

Process 8: Set the standby state to accept the one-shot start trigger (Note).

b7b0

Timer Y, Z mode register (TYZM) [Address 2016]

Timer Z count start

Process 7: Set the one-shot pulse width (Note 1).

• Set the count value to prescaler Z and timer Z primary

Count value

Timer Z primary (TZP) [Address 2716] (Note 3)

Note: When the INT0 pin one-shot trigger control bit of PUM is set to“valid”,

timer Z counting is started by the input of trigger to INT0 pin after this setting.

Notes 1: In the programmable one-shot generation mode, TZS is not used.

When the count setting value is changed, value of EXPZP is valid by

writing to TZP. Even when changing TZP is not required, write the

same value again.

2: When the timer Z waveform extension function is used, be sure to set

“0016” to prescaler Z.

3: In the programmable one-shot generation mode, when the setting

value is changed while the waveform is output, set by software in

order not to execute the writing to TZP and the timing of timer Z

underflow simultanesously.

Process 6: Set the timer Z count source.

Timer count source set register (TCSS) [Address 2E16]

Timer Z count source selection bits

b5 b4

0 0 : f(XIN)/16

0 1 : f(XIN)/2

1 0 : Timer Y underflow (Note)

1 1 : Not available

Process 5: When the trigger by INT0 pin input is selected:

Set port P3 direction register, pull-up control register and port P1P3 control register

Pull-up control register (PULL) [Address 1616]

P37 pull-up control bit

0: Pull-up Off

1: Pull-up On

b7b0

Port P1P3 control register (P1P3C) [Address 1716]

P37/INT0 input level selection bit

0: CMOS level

1: TTL level

b7b0

Port P3 direction register (P3D) [Address 0716]

Set P37/INT0 pin as the input mode

b7b0

Note: When the timer Z waveform extension function is used,

do not select the timer Y underflow as the timer Z count source.

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