MC80F0204 Datasheet, PDF(53/126 Page) List of Unclassifed Manufacturers

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

MC80F0204 Datasheet, PDF (53/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

◁

Preliminary

MC80F0104/0204

Example 1:

Timer0 = 2ms 8-bit timer mode at 4MHz

Timer1 = 0.5ms 8-bit timer mode at 4MHz

Timer2 = 1ms 8-bit timer mode at 4MHz

Timer3 = 1ms 8-bit timer mode at 4MHz

LDM

SET1

Example 2:

TDR0,#249

TDR1,#249

TDR2,#249

TDR3,#249

TM0,#0000_1111B

TM1,#0000_1011B

TM2,#0000_1111B

TM3,#0000_1011B

T0E

T1E

T2E

T3E

Timer0 = 8-bit event counter mode

Timer1 = 0.5ms 8-bit timer mode at 4MHz

Timer2 = 8-bit event counter mode

Timer3 = 1ms 8-bit timer mode at 4MHz

LDM

SET1

TDR0,#249

TDR1,#249

TDR2,#249

TDR3,#249

TM0,#0001_1111B

TM1,#0000_1011B

TM2,#0001_1111B

TM3,#0000_1011B

T0E

T1E

T2E

T3E

These timers have each 8-bit count register and data regis-

ter. The count register is increased by every internal or ex-

ternal clock input. The internal clock has a prescaler divide

ratio option of 2, 4, 8, 32, 128, 512, 2048 selected by con-

trol bits T0CK[2:0] of register TM0 or 1, 2, 8 selected by

control bits T1CK[1:0] of register TM1, or 2, 4, 8, 16, 64,

256, 1024 selected by control bits T2CK[2:0] of register

TM2, or 1, 4, 16 selected by control bits T3CK[1:0] of reg-

ister TM3. In the Timer 0, timer register T0 increases from

00H until it matches TDR0 and then reset to 00H. The

match output of Timer 0 generates Timer 0 interrupt

(latched in T0IF bit).

In counter function, the counter is increased every 0-to-1

(rising edge) transition of EC0 pin. In order to use counter

function, the bit EC0 of the Port Selection Register

(PSR0.4) is set to "1". The Timer 0 can be used as a counter

by pin EC0 input, but Timer 1 can not. Likewise, In order

to use Timer2 as counter function, the bit EC1 of the Port

Selection Register (PSR0.5) is set to "1". The Timer 2 can

be used as a counter by pin EC1 input, but Timer 3 can not.

13.1.1 8-bit Timer Mode

In the timer mode, the internal clock is used for counting

up. Thus, you can think of it as counting internal clock in-

put. The contents of TDRn are compared with the contents

of up-counter, Tn. If match is found, a timer n interrupt

(TnIF) is generated and the up-counter is cleared to 0.

Counting up is resumed after the up-counter is cleared.

As the value of TDRn is changeable by software, time in-

terval is set as you want.

Source clock

Up-counter

TDR1

T1IF interrupt

Start count

n-2 n-1 n 0 1

Match Counter

Detect Clear

Figure 13-5 Timer Mode Timing Chart

Mar. 2005 Ver 0.2

▷