4559 datasheet(31/148 Pages) RENESAS

31 / 148 page

Rev.1.04

Aug 23, 2007

Page 31 of 146

REJ03B0188-0104

4559 Group

The 4559 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 : 16-bit fixed frequency timer

• Timer LC : 4-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, timer 3 and timer LC can be

controlled with the timer control registers PA and W1 to W4. The

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

control register.

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)

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 INT input)

(carrier wave output auto-

control function)

• PWM signal (PWMOUT)

• Prescaler output (ORCLK)

• Timer 3 underflow (T3UDF)

• CNTR input

1 to 256

• CNTR output control

• Timer 1 interrupt

Timer 2

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

• CNTR output

• Timer 2 interrupt

Timer 3

16-bit fixed dividing

frequency

•XIN input

• Prescaler output (ORCLK)

8192

16384

32768

65536

• Timer 1 count source

• Timer LC count source

• Timer 3 interrupt

Timer LC

4-bit programmable binary

down counter

• Bit 4 of timer 3 (T34)

• System clock (STCK)

1 to 16

• LCD clock

Watchdog

timer

16-bit fixed dividing

frequency

• Instruction clock (INSTCK)

65536

• System reset (counting twice)

• Decision of flag WDF1

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