4553 datasheet(64/145 Pages) RENESAS

64 / 145 page

Rev.3.02

Dec 22, 2006

page 64 of 142

REJ03B0024-0302

4553 Group

➅ Timer count source

Stop timer 1, 2 and LC counting to change its count source.

➆ Reading the count value

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

struction (TAB1, TAB2) to read its data.

➇ Writing to the timer

Stop timer 1, 2 or LC counting and then execute the data write in-

struction (T1AB, T2AB, TLCA) to write its data.

➈ Writing to reload register R1, R2H

When writing data to reload register R1, reload register R2H

while timer 1 or timer 2 is operating, avoid a timing when timer 1

or timer 2 underflows.

Timer 2

Avoid a timing when timer 2 underflows to stop timer 2 at PWM

output function used.

When “H” interval extension function of the PWM signal is set to

be “valid”, set “1” or more to reload register R2H.

Timer 3

Stop timer 3 counting to change its count source.

Timer input/output pin

Set the port C output latch to “0” to output the PWM signal from

C/CNTR pin.

LIST OF PRECAUTIONS

➀ Noise and latch-up prevention

Connect a capacitor on the following condition to prevent noise

and latch-up;

• connect a bypass capacitor (approx. 0.1

µF) between pins VDD

and VSS at the shortest distance,

• equalize its wiring in width and length, and

• use relatively thick wire.

In the One Time PROM version, CNVSS pin is also used as VPP

pin. Accordingly, when using this pin, connect this pin to VSS

through a resistor about 5 k

Ω (connect this resistor to CNVSS/

VPP pin as close as possible).

In addtion, the MCU may be replaced with mask ROM version

without the need to remove the resistor from the circuit and with-

out any adverse effect on operation.

➁ Register initial values 1

The initial value of the following registers are undefined after sys-

tem is released from reset. After system is released from reset,

set initial values.

• Register Z (2 bits)

• Register D (3 bits)

• Register E (8 bits)

➂ Register initial values 2

The initial value of the following registers are undefined at RAM back-

up. After system is returned from RAM back-up, set initial values.

• Register Z (2 bits)

• Register X (4 bits)

• Register Y (4 bits)

• Register D (3 bits)

• Register E (8 bits)

➃ Stack registers (SKS)

Stack registers (SKs) are eight identical registers, so that subrou-

tines can be nested up to 8 levels. However, one of stack

registers is used respectively when using an interrupt service

routine and when executing a table reference instruction. Accord-

ingly, be careful not to over the stack when performing these

operations together.

➄ Prescaler

Stop counting and then execute the TABPS instruction to read

from prescaler data.

Stop counting and then execute the TPSAB instruction to set

prescaler data.

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