M38039G8HKP datasheet(87/92 Pages) RENESAS

87 / 92 page

Rev.1.10

Nov 14, 2005

Page 87 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

Notes on 8-bit Timer (timer 1, 2, X, Y)

• If a value n (between 0 and 255) is written to a timer latch, the

frequency division ratio is 1/(n+1).

• When switching the count source by the timer 12, X and Y

count source selection bits, the value of timer count is altered

in unconsiderable amount owing to generating of thin pulses in

the count input signals.

Therefore, select the timer count source before set the value to

the prescaler and the timer.

• Set the double-function port of the CNTR0/CNTR1 pin and

port P54/P55 to output in the pulse output mode.

• Set the double-function port of CNTR0/CNTR1 pin and port

P54/P55 to input in the event counter mode and the pulse width

measurement mode.

Notes on 16-bit Timer (timer Z)

1. Pulse output mode

• Set the double-function port of the CNTR2 pin and port P47 to

output.

2. Pulse period measurement mode

• Set the double-function port of the CNTR2 pin and port P47 to

input.

• A read-out of timer value is impossible in this mode. The timer

can be written to only during timer stop (no measurement of

pulse period).

• Since the timer latch in this mode is specialized for the read-

out of measured values, do not perform any write operation

during measurement.

• “FFFF16” is set to the timer when the timer underflows or

when the valid edge of measurement start/completion is

detected.

Consequently, the timer value at start of pulse period

measurement depends on the timer value just before

measurement start.

3. Pulse width measurement mode

• Set the double-function port of the CNTR2 pin and port P47 to

input.

• A read-out of timer value is impossible in this mode. The timer

can be written to only during timer stop (no measurement of

pulse period).

• Since the timer latch in this mode is specialized for the read-

out of measured values, do not perform any write operation

during measurement.

• “FFFF16” is set to the timer when the timer underflows or

when the valid edge of measurement start/completion is

detected.

Consequently, the timer value at start of pulse width

measurement depends on the timer value just before

measurement start.

4. Programmable waveform generating mode

• Set the double-function port of the CNTR2 pin and port P47 to

output.

5. Programmable one-shot generating mode

• Set the double-function port of CNTR2 pin and port P47 to

output, and of INT1 pin and port P42 to input in this mode.

• This mode cannot be used in low-speed mode.

• If the value of the CNTR2 active edge switch bit is changed

during one-shot generating enabled or generating one-shot

pulse, then the output level from CNTR2 pin changes.

6. All modes

• Timer Z write control

Which write control can be selected by the timer Z write control

bit (bit 3) of the timer Z mode register (address 002A16), writing

data to both the latch and the timer at the same time or writing

data only to the latch.

When the operation “writing data only to the latch” is selected,

the value is set to the timer latch by writing data to the address of

timer Z and the timer is updated at next underflow. After reset

release, the operation “writing data to both the latch and the timer

at the same time” is selected, and the value is set to both the latch

and the timer at the same time by writing data to the address of

timer Z.

In the case of writing data only to the latch, if writing data to the

latch and an underflow are performed almost at the same time,

the timer value may become undefined.

• Timer Z read control

A read-out of timer value is impossible in pulse period

measurement mode and pulse width measurement mode. In the

other modes, a read-out of timer value is possible regardless of

count operating or stopped.

However, a read-out of timer latch value is impossible.

• Switch of interrupt active edge of CNTR2 and INT1

Each interrupt active edge depends on setting of the CNTR2

active edge switch bit and the INT1 active edge selection bit.

• Switch of count source

When switching the count source by the timer Z count source

se lec tion bi ts, t h e va lue of t imer count is al tered in

inconsiderable amount owing to generating of thin pulses on the

count input signals.

Therefore, select the timer count source before setting the value

to the prescaler and the timer.

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