7540 datasheet(156/366 Pages) RENESAS

156 / 366 page

2-80

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.5 Timer Y and timer Z

(2) Programmable waveform generation mode setting method

Figure 2.5.24 and Figure 2.5.25 show the setting method for programmable waveform generation

mode of timer Y.

When timer Z is used, registers are set by the same method.

Fig. 2.5.24 Setting method for programmable waveform generation mode (1)

b7b0

Timer Y primary waveform extension control bit (Note)

0: Waveform not extended

1: Waveform extended

Timer Y secondary waveform extension control bit (Note)

0: Waveform not extended

1: Waveform extended

Timer Y output level latch

0: Initial state at stop: “L”, “H” interval by TYP setting value,

“L” interval by TYS setting value

1: Initial state at stop: “H”, “L” interval by TYP setting value,

“H” interval by TYS setting value

Process 4: Set TYOUT pin to the output (Note).

Port P0 direction register (P0D) [Address 0116]

Set P01/TYOUT pin as the output mode

b7b0

Note: For timer Z, set TZOUT pin as the output by bit 2 of P0D.

Note: When using this mode, be sure to set “1” to the timer Y write control bit

to select “write to latch only”.

Process 1: Disable timer Y interrupt.

Process 2: Set timer Y, Z mode register.

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

Programmable waveform generation mode

Write to only latch (Note)

Timer Y count stop

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

Timer Y interrupt disabled

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

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

Note: The waveform extension function by the timer Y waveform extension

control bits can be used only when “0016” is set to prescaler Y.

When the value other than “0016” is set to prescaler Y, be sure to set “0”

to EXPYP and EXPYS.

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.

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