7540 datasheet(142/366 Pages) RENESAS

142 / 366 page

2-66

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.5 Timer Y and timer Z

Fig. 2.5.6 Structure of Timer Y, Z mode register

Fig. 2.5.7 Structure of Prescaler Y, Prescaler Z

Prescaler Y, Prescaler Z

b7b6b5b4b3 b2b1b0

Function

At reset

Prescaler Y (PREY) [Address : 2116]

Prescaler Z (PREZ) [Address : 2516]

•Set a count value of each prescaler.

•While the corresponding timer is stopped, the value set in this

and the corresponding prescaler latch at the same time.

•While the corresponding timer is operating, the value set in this

When the timer write control bit is “0”, the value is written to

prescaler latch and prescaler at the same time.

When the timer write control bit is “1”, the value is written to

prescaler latch only.

•When this register is read out, the count value of the

corresponding prescaler is read out.

Timer Y, Z mode register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Nothing is allocated for this bit. This is a write disabled bit.

When this bit is read out, the value is “0”.

Timer Y, Z mode register (TYZM) [Address : 20 16)

Timer Y operating mode bit

0 : Timer mode

1 : Programmable waveform

generation mode

Timer Y write control bit

(Note)

0 : Write to latch and timer

simultaneously

1 : Write to only latch

Timer Y count stop bit

0 : Count start

1 : Count stop

Timer Z operating mode bits

b5 b4

0 0 : Timer mode

0 1 : Programmable waveform

generation mode

1 0 : Programmable one-shot

generation mode

1 1 : Programmable wait one-shot

generation mode

Timer Z write control bit

(Note)

0 : Write to latch and timer

simultaneously

1 : Write to only latch

Timer Z count stop bit

0 : Count start

1 : Count stop

Note: When modes other than the timer mode, set these bits to “1”.

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