4570 datasheet(21/69 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4570 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

The 4570 Group timer consists of the following circuits.

• Prescaler : frequency divider

• Timer 1 : 10-bit programmable timer with the interrupt function

and the carrier wave output auto-control function

• Timer 2 : 8-bit programmable timer with the interrupt function

• Timer 3 : 8-bit programmable timer with the interrupt function

and the carrier wave generation function

• 16-bit timer

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

timer control registers W1, W2 and W3.

16-bit timer is the free-run counter without the control register.

Each function is described below.

Table 9 Function related timers

Count source

• Instruction clock

• Prescaler output (ORCLK)

• Carrier wave generating circuit

output (CARRY)

• Prescaler output (ORCLK)

• Timer 1 underflow

• Instruction clock

• 16-bit timer underflow

• Prescaler output (ORCLK)

• Timer 2 underflow

• f(XIN) or f(XIN)/2

• Instruction clock

Structure

Frequency divider

10-bit programmable

binary down counter

8-bit programmable

binary down counter

8-bit programmable

binary down counter

16-bit fixed

dividing frequency

Circuit

Prescaler

Timer 1

Timer 2

Timer 3

16-bit timer

Use of output signal

• Timer 1, 2 and 3 count sources

• Timer 1 interrupt

• Carrier wave output auto-control

• Timer 2 count source

• Timer 2 interrupt

• Timer 3 count source

• TOUT output

• Timer 3 interrupt

• Timer 1 count source

• Carrier wave

• Watchdog timer

(15-th bit output is counted

twice.)

• Timer 2 count source

(16-bit timer underflow)

Frequency

dividing ratio

4, 8

1 to 1024

1 to 256

65536

Control

(W5)

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