HMS87C1202A datasheet(46/88 Pages) HYNIX

46 / 88 page

HMS87C130XA/120XA/110XA

Apr. 2001 ver1.0

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 T0CK2, T0CK1 and T0CK0 of register TM0) and

1, 2, 8 (selected by control bits T1CK1 and T1CK0 of reg-

ister TM1). 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 T0F bit). As TDRx and Tx register are in same

address, when reading it as a Tx, written to TDRx.

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 RA0 of the RA Direction Register RAIO

is set to “0”. The Timer 0 can be used as a counter by pin

EC0 input, but Timer 1 can not.

Figure 12-3 Counting Example of Timer Data Registers

Figure 12-4 Timer Count Operation

Timer 1 (T1IF)

Interrupt

TDR1

TIME

Occur interrupt

Interrupt period

n-1

PCP

= PCP x (n+1)

Timer 1 (T1IF)

Interrupt

TDR1

TIME

Occur interrupt

stop

clear & start

disable

enable

Start & Stop

T1ST

T1CN

Control count

T1ST = 0

T1ST = 1

T1CN = 0

T1CN = 1

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