MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

MC80F0704/0708/0804/0808

13.1 8-bit Timer / Counter Mode

The MC80F0704/0708/0804/0808 has four 8-bit Timer/

Counters, Timer 0, Timer 1, Timer 2, Timer 3. The Timer 0, Tim-

er 1 are shown in Figure 13-3 and Timer 2, Timer 3 are shown in

Figure 13-4 .

The “timer” or “counter” function is selected by control registers

TM0, TM1, TM2, TM3 as shown in Figure 13-1 . To use as an 8-

bit timer/counter mode, bit CAP0, CAP1, CAP2, or CAP3 of

TMx should be cleared to “0” and 16BIT and PWM1E or

PWM3E of TM1 or TM3 should be cleared to "0" (Figure 13-3 ).

These timers have each 8-bit count register and data register. The

count register is increased by every internal or external clock in-

put. The internal clock has a prescaler divide ratio option of 1, 2,

4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048 or external clock (se-

lected by control bits TxCK0, TxCK1, TxCK2 of register TMx).

TM0

TM1

7

6

5

4

3

2

1

0

-

- CAP0 T0CK2 TB0TCCKL1 T0CK0 T0CN T0ST

-

-

0

X

X

X

X

X

ADDRESS: 0D0H

INITIAL VALUE: --00 0000B

X means don’t care

7

6

5

4

3

2

1

0

POL 16BIT PWM1E CAP1 TB1TCCKL1 T1CK0 T1CN T1ST

X0

0

0

X

X

X

X

ADDRESS: 0D2H

INITIAL VALUE: 00H

X means don’t care

EC0 PIN

XIN PIN

EDGE

DETECTOR

T0CK[2:0]

111

÷ 2 000

÷4

001

÷8

010

÷ 32 011

÷ 128

100

÷ 512 101

÷ 2048 110

MUX

T1CK[1:0]

11

÷1

00

÷2

01

÷ 8 10

MUX

T0CN

TIMER 0

T0ST

0: Stop

1: Clear and start

T0 (8-bit)

clear

Comparator

TDR0 (8-bit)

T0IF

TIMER 0

INTERRUPT

F/F

R05 / T0O

T1CN

TIMER 1

T1ST

0: Stop

1: Clear and start

T1 (8-bit)

clear

Comparator

TDR1 (8-bit)

T1IF

TIMER 1

INTERRUPT

Figure 13-3 8-bit Timer/Counter 0, 1

October 31, 2011 Ver 1.03

53

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