C511 datasheet(49/128 Pages) SIEMENS

49 / 128 page

Semiconductor Group

6-16

On-Chip Peripheral Units

6.2.1 Timer/Counter 0 and 1

Timer / counter 0 and 1 of the SAB-C511/513 family components are fully compatible with timer /

counter 0 and 1 of the 8051 microcontroller and can be used in the same four operating modes:

Mode 0: 8-bit timer/counter with a divide-by-32 prescaler

Mode 1: 16-bit timer/counter

Mode 2: 8-bit timer/counter with 8-bit auto-reload

Mode 3: Timer/counter 0 is split into one 8-bit timer/counter and one 8-bit timer when programmed

to this mode. Timer/counter 1 set to this mode will simply hold its count. The effect is the

same as setting TR1 = 0, disabling the counter.

The external inputs INT0 and INT1 can be programmed to function as a gate for timer/counters 0

and 1 to facilitate pulse width measurements.

Each timer consists of two 8-bit registers (TH0 and TL0 for timer/counter 0, TH1 and TL1 for timer/

counter 1) which may be combined to one timer configuration depending on the mode that is

established. The functions of the timers are controlled by two special function registers TCON and

TMOD.

In the following descriptions the symbols TH0 and TL0 are used to specify the high-byte and the

low-byte of timer 0 (TH1 and TL1 for timer 1, respectively). The operating modes are described and

shown for timer 0. If not explicity noted, this applies also to timer 1.

Special Function Register TCON (Address 88H)

Reset Value : 00H

Bit

Function

TR0

Timer 0 run control bit.

Set/cleared by software to turn timer/counter 0 ON/OFF.

TF0

Timer 0 overflow flag. Set by hardware on timer/counter overflow.

Cleared by hardware when processor vectors to interrupt routine.

TR1

Timer 1 run control bit.

Set/cleared by software to turn timer/counter 1 ON/OFF.

TF1

Timer 1 overflow flag. Set by hardware on timer/counter overflow.

Cleared by hardware when processor vectors to interrupt routine.

TF1

TR1

TF0

TR0

88H

TCON

Bit No.

MSB

LSB

IE1

IT1

IE0

IT0

These bits are not used in controlling timer/counter 0 and 1.

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