4571 datasheet(27/126 Pages) RENESAS

27 / 126 page

Rev.1.02

May 25, 2007

Page 27 of 124

REJ03B0179-0102

4571 Group

The 4571 Group timer consists of the following circuits.

• Prescaler : 8-bit programmable timer

• Timer 1 : 8-bit programmable timer

• Timer 2 : 8-bit programmable timer

• Timer 3 : 8-bit programmable timer

• Watchdog timer: 16-bit fixed frequency timer

(Timers 1, 2 and 3 have the interrupt function, respectively)

Prescaler, timer 1, timer 2 and timer 3 can be controlled with the

timer control registers PA, W1, W2, W3 and W5. The watchdog

timer is a free counter which is not controlled with the control

Each function is described below.

Table 16 Function related timers

Circuit

Structure

Count source

Frequency

dividing ratio

Use of output signal

Control

Prescaler

8-bit programmable

binary down counter

• Instruction clock (INSTCK)

• Instruction clock divided by 4

(INSTCK/4)

1 to 256

• Timer 1 count source

• Timer 2 count source

• Timer 3 count source

Timer 1

8-bit programmable

binary down counter

(link to INT0 input)

(carrier wave output auto-

control function)

• PWM signal (PWMOUT)

• Prescaler output (ORCLK)

• CNTR0 input (CNTR0IN)

• System clock (STCK)

1 to 256

• Timer 2 count source

• CNTR0 output

• Carrier wave output auto-

control

• Timer 1 interrupt

Timer 2

8-bit programmable

binary down counter

• PWM signal (PWMOUT)

• Timer 1 underflow (T1UDF)

• Prescaler output (ORCLK)

• System clock (STCK)

1 to 256

• CNTR0 output

• Timer 2 interrupt

Timer 3

8-bit programmable

binary down counter

(with carrier wave

generation function)

•XIN input

• Prescaler output divided by 2

(ORCLK/2)

1 to 256

• Timer 1 count source

• Timer 2 count source

• CNTR1 output

• Timer 3 interrupt

Watchdog

timer

16-bit fixed dividing

frequency

• Instruction clock (INSTCK)

65536

• System reset (counting twice)

• Decision of flag WDF1

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