4553 datasheet(33/145 Pages) RENESAS

33 / 145 page

Rev.3.02

Dec 22, 2006

page 33 of 142

REJ03B0024-0302

4553 Group

(1) Timer control registers

• Timer control register PA

contents of this register through register A with the TPAA instruc-

tion.

• Timer control register W1

cuit, and the count operation and count source of timer 1. Set the

contents of this register through register A with the TW1A instruc-

tion. The TAW1 instruction can be used to transfer the contents

of register W1 to register A.

• Timer control register W2

terval of PWM output, and the count operation and count source

of timer 2. Set the contents of this register through register A with

the TW2A instruction. The TAW2 instruction can be used to trans-

fer the contents of register W2 to register A.

• Timer control register W3

timer 3. Set the contents of this register through register A with

the TW5A instruction. The TAW3 instruction can be used to trans-

fer the contents of register W3 to register A.

• Timer control register W4

the selection of CNTR output auto-control circuit and the count

edge of CNTR input. Set the contents of this register through reg-

ister A with the TW4A instruction. The TAW4 instruction can be

used to transfer the contents of register W4 to register A..

(2) Prescaler (interrupt function)

Prescaler is an 8-bit binary down counter with the prescaler reload

reload register RPS with the TPSAB instruction. Data can be read

from reload register RPS with the TABPS instruction.

Stop counting and then execute the TPSAB or TABPS instruction

to read or set prescaler data.

Prescaler starts counting after the following process;

➀ set data in prescaler, and

➁ set the bit 0 of register PA to “1.”

When a value set in reload register RPS is n, prescaler divides the

count source signal by n + 1 (n = 0 to 255).

Count source for prescaler is the instruction clock (INSTCK).

Once count is started, when prescaler underflows (the next count

pulse is input after the contents of prescaler becomes “0”), new

data is loaded from reload register RPS, and count continues

(auto-reload function).

The output signal (ORCLK) of prescaler can be used for timer 1, 2,

and 3 count sources.

(3) Timer 1 (interrupt function)

Timer 1 is an 8-bit binary down counter with the timer 1 reload reg-

ister (R1). Data can be set simultaneously in timer 1 and the reload

load register (R1) with the TR1AB instruction. Data can be read

from timer 1 with the TAB1 instruction.

Stop counting and then execute the T1AB or TAB1 instruction to

read or set timer 1 data.

When executing the TR1AB instruction to set data to reload regis-

ter R1 while timer 1 is operating, avoid a timing when timer 1

underflows.

Timer 1 starts counting after the following process;

➀ set data in timer 1

➁ set count source by bits 0 and 1 of register W1, and

➂ set the bit 2 of register W1 to “1.”

When a value set in reload register R1 is n, timer 1 divides the

count source signal by n + 1 (n = 0 to 255).

Once count is started, when timer 1 underflows (the next count

pulse is input after the contents of timer 1 becomes “0”), the timer

1 interrupt request flag (T1F) is set to “1,” new data is loaded from

reload register R1, and count continues (auto-reload function).

INT pin input can be used as the start trigger for timer 1 count op-

eration by setting the bit 0 of register I1 to “1.”

Also, in this time, the auto-stop function by timer 1 underflow can

be performed by setting the bit 3 of register W1 to “1.”

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