7540 datasheet(157/366 Pages) RENESAS

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2-81

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.5 Timer Y and timer Z

Fig. 2.5.25 Setting method for programmable waveform generation mode (2)

b7b0

Process 7: In order not to execute the no requested interrupt processing,

set “0” (no requested) to the timer Y interrupt request bit.

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

Process 8: When Timer Y interrupt is used, set “1” (interrupt enabled)

to the timer Y interrupt enable bit.

No timer Y interrupt request issued

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

Timer Y interrupt enabled

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

Timer Y count start

Process 9: Start counting of timer Y.

b7b0

Notes 1: For Timer Z, f(XIN)/16, f(XIN)/2, or timer Y underflow can be selected.

However, when the timer Z waveform expansion function is used,

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

2: Set the on-chip oscillator oscillation to be enabled by bit 3 (on-chip oscillator

oscillation control bit) of CPU mode register.

Process 6: Set the count value to timer Y (Note 1).

• Set the count value to prescaler Y, timer Y secondary and timer Y primary

Count value

Timer Y secondary (TYS) (Address 2216)

Count value

Process 5: Set timer Y count source (Note 1).

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

Timer Y count source selection bits

b3 b2

0 0 : f(XIN)/16

0 1 : f(XIN)/2

1 0 : On-chip oscillator output (Note 2)

1 1 : Not available

Prescaler Y (PREY) (Address 2116) (Note 2)

Timer Y primary (TYP) (Address 2316) (Notes 3, 4)

Count value

Notes 1: In the programmable waveform generation mode, values of TYS,

EXPYP, and EXPYS are valid by writing to TYP. Even when

changing TYP is not required, write the same value again.

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

“0016” to prescaler Y.

3: In the programmable waveform generation mode, when the setting

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

order not to execute the writing to TYP and the timing of timer Y

underflow during the secondary interval simultanesously.

4: Count values of the primary interval and secondary interval can be

checked by reading the TYP (TYS is undefined at read).

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