4559 datasheet(35/148 Pages) RENESAS

35 / 148 page

Rev.1.04

Aug 23, 2007

Page 35 of 146

REJ03B0188-0104

4559 Group

(1) Timer control registers

• Timer control register PA

contents of this register through register A with the TPAA

instruction.

• Timer control register W1

timer 1, and timer 1 count auto-stop circuit. Set the contents of

this register through register A with the TW1A instruction.

The TAW1 instruction can be used to transfer the contents of

• Timer control register W2

timer 2, CNTR pin output, and extension function of PWM

signal “H” interval. Set the contents of this register through

can be used to transfer the contents of register W2 to register

• Timer control register W3

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

the TW3A instruction. The TAW3 instruction can be used to

transfer the contents of register W3 to register A.

• Timer control register W4

CNTR1 pin output auto-control circuit. Set the contents of this

TAW4 instruction can be used to transfer the contents of

(2) Prescaler

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

reload register PRS. Data can be set simultaneously in prescaler

and the 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;

(1) set data in prescaler, and

(2) 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 can be selected 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 a timer 1 reload

reload register R1 with the T1AB 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

1 underflows.

Timer 1 starts counting after the following process;

(1) set data in timer 1

(2) set count source by bit 0 and 1 of register W1, and

(3) 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

operation 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.”

(4) Timer 2 (interrupt function)

Timer 2 is an 8-bit binary down counter with two timer 2 reload

and the reload register R2L with the T2AB instruction. Data can

be set in the reload register R2H with the T2HAB instruction.

The contents of reload register R2L set with the T2AB

instruction can be set to timer 2 again with the T2R2L

instruction. Data can be read from timer 2 with the TAB2

instruction.

Stop counting and then execute the T2AB or TAB2 instruction to

read or set timer 2 data.

When executing the T2HAB instruction to set data to reload

timer 2 underflows.

Timer 2 starts counting after the following process;

(1) set data in timer 2

(2) set count source by bit 0 of register W2, and

(3) set the bit 1 of register W2 to “1.”

When a value set in reload register R2L is n and R2H is m, timer

2 divides the count source signal by n + 1 or m + 1 (n = 0 to 255,

m = 0 to 255).

Once count is started, when timer 2 underflows (the next count

pulse is input after the contents of timer 2 becomes “0”), the

timer 2 interrupt request flag (T2F) is set to “1,” new data is

loaded from reload register R2L, and count continues (auto-

reload function).

When bit 3 of register W2 is set to “1”, timer 2 reloads data from

reload register R2L and R2H alternately each underflow.

Timer 2 generates the PWM signal (PWMOUT) of the “L”

interval set as reload register R2L, and the “H” interval set as

reload registerR2H. The PWM signal (PWMOUT) is output

from CNTR pin. When bit 2 of register W2 is set to “1” at this

time, the interval (PWM signal “H” interval) set to reload

period of count source.

In this case, when a value set in reload register R2H is m, timer 2

divides the count source signal by n + 1.5 (m = 1 to 255).

When this function is used, set “1” or more to reload register

R2H.

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