4250 datasheet(22/59 Pages) RENESAS

部品番号	4250

部品情報	SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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メーカー	RENESAS [Renesas Technology Corp]

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21

MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

The 4250 Group timer consists of the following circuits.

• Prescaler : frequency divider

• Timer 1 : 8-bit programmable timer with the interrupt function

These timers can be controlled with the timer control register V1

and key-on wakeup control register K0.

Each function is described below.

Table 9 Function related timers

Circuit

Prescaler

Timer 1

Structure

Frequency divider

8-bit programmable

binary down counter

Count source

Instruction clock

Prescaler output (ORCLK)

Frequency

dividing ratio

4, 512

1 to 256

Use of output signal

• Timer 1 count source

• TOUT pin

• Timer 1 interrupt

Fig. 19 Timers structure

Control

register

V1

K0

V1

Count source is stopped by clearing to “0.”

Data is automatically set from a reload register

when timer 1 underflows (auto-reload function).

Timer 1 reload register R 1(8)

Timer 1 (8)

Register B(4)

T1F

Timer 1

interrupt

TAB1 instruction

Register A(4)

TAB1

instruction

Bit 7

Bit 0

1/2

1

0

V13

G1 output

G1/TOUT

T1AB

instruction

G1 input

Instruction clock

XIN

ORCLK

1/4

1/512

V12

0

1

0

1

K03

Prescaler

1

0

V12(Note)

Timer 1 underflow

signal

Internal clock

generating circuit

(divided by 4)

Note:

:

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