M34283G2GP datasheet(13/64 Pages) RENESAS

13 / 64 page

Rev.1.01

Mar 20, 2006

page 13 of 62

REJ03B0109-0101

4283 Group

Table 4 Control registers related to timer

V12

V11

V10

Timer control register V1

Auto-control output by timer 1 is invalid

Auto-control output by timer 1 is valid

Carrier wave output (CARRY)

Bit 5 of watchdog timer (WDT)

Stop (Timer 1 state retained)

Operating

Carrier wave output auto-control bit

Timer 1 count source selection bit

Timer 1 control bit

at reset : 0002

at RAM back-up : 0002

V23

V22

V21

V20

Timer control register V2

To expand “H” interval is invalid

To expand “H” interval is valid (when V22=1 selected)

Carrier wave generation function invalid

Carrier wave generation function valid

f(XIN)

f(XIN)/2

Stop (Timer 2 state retained)

Operating

Carrier wave “H” interval expansion bit

Carrier wave generation function control bit

Timer 2 count source selection bit

Timer 2 control bit

at reset : 00002

at RAM back-up : 00002

Note: “W” represents write enabled.

(1) Control registers related to timer

•

Timer control register V1

control function of carrier wave output from port CARR by

timer 1. Set the contents of this register through register A

with the TV1A instruction.

•

Timer control register V2

wave generation function by timer. Set the contents of this

(2) Precautions

Note the following for the use of timers.

•

Count source

Stop timer 1 or timer 2 counting to change its count source.

•

Reading the count value

Stop timer 1 or 2 counting and then execute the data read

instruction (TAB1, TAB2) to read its data.

•

Watchdog timer

Be sure that the timing to execute the WRST instruction in

order to operate WDT efficiently.

•

Writing to reload register R1

When writing data to reload register R1 while timer 1 is

operating, avoid a timing when timer 1 underflows.

•

Timer 1 count operation

When the bit 5 of the watchdog timer (WDT) is selected as

the timer 1 count source, the error of maximum ± 256

µs

(at the minimum instruction execution time : 8

µs) is

generated from timer 1 start until timer 1 underflow. When

programming, be careful about this error.

•

Stop of timer 2

Avoid a timing when timer 2 underflows to stop timer 2.

•

Writing to reload register R2H

When writing data to reload register R2H while timer 2 is

operating, avoid a timing when timer underflows.

•

Timer 2 carrier wave output function

When to expand “H” interval of carrier wave is valid, set “1”

or more to reload register R2H.

•

Timer 1 and timer 2 carrier wave output function

Count starts from the rising edge ➁ in Fig. 14 after the first

falling edge of the count source, after timer 1 and timer 2

operations start ① in Fig. 14.

Time to first underflow ③ in Fig. 14 is different from time

among next underflow ④ in Fig. 14 by the timing to start the

timer and count source operations after count starts.

Fig. 14 Count start time and count time when operation

starts (T1, T2)

032

103

➀

➃

➂

➁

Timer start

Count source

Timer value

Timer underflow signal

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