7540 datasheet(170/366 Pages) RENESAS

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2-94

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.5 Timer Y and timer Z

Fig. 2.5.36 Setting method for programmable wait one-shot generation mode (1)

b7b0

1 1

b7b0

Timer Z primary waveform extension control bit (Note 1)

0: Waveform not extended

1: Waveform extended

Timer Z secondary waveform extension control bit (Note 1)

0: Waveform not extended

1: Waveform extended

Timer Z output level latch

0: “L” level is output at timer stop. When count is started, “L”

level is output during the TZP interval (wait), and them, “H”

level is output during the TZS interval (one-shot) and timer

Z output is stopped at “L” level by underflow.

1: “H” level is output at timer stop. When count is started, “H”

level is output during the TZP interval (wait), and them, “L”

level is output during the TZS interval (one-shot) and timer

Z output is stopped at “H” level by underflow.

INT0 pin one-shot trigger control bit (Note 2)

0: INT0 pin one-shot trigger invalid

1: INT0 pin one-shot trigger valid

INT0 pin one-shot trigger active edge selection bit (Note 2)

0: Falling edge trigger

1: Rising edge trigger

Process 4: Set TZOUT pin to the output.

Port P0 direction register (P0D) [Address 0116]

Set P02/TZOUT pin as the output mode

Note: When using this mode, be sure to select “write to latch only”.

Process 1: Disable interrupt.

Process 2: Set timer Y, Z mode register.

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

Programmable wait one-shot generation mode

Write to only latch (Note)

Timer Y count stop

Interrupt control register 1 (ICON1) [Address 3E16]

INT0 interrupt disabled

Process 3: Set timer Y, Z waveform output control register.

Timer Y, Z waveform output control register (PUM) [Address 2416]

Notes 1: The waveform extension function by the timer Z waveform extension control bits can be used

only when “0016” is set to prescaler Z.

When the value other than “0016” is set to prescaler Z, be sure to set “0” to EXPZP and EXPZS.

Also, when the timer Y underflow is selected as the timer Z count source, the waveform

extension function cannot be used.

2: Stop Timer Z to change these bits.

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

Timer Z interrupt disabled

(2) Programmable wait one-shot generation mode setting method

Figure 2.5.36 to Figure 2.5.38 show the setting method for programmable wait one-shot generation

mode of Timer Z.

7540 Datasheet(PDF) 170 Page - Renesas Technology Corp

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