P83C524 datasheet(24/76 Pages) PHILIPS

24 / 76 page

1997 Dec 15

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers

P83C524; P80C528; P83C528

11.1.1

TIMER/COUNTER MODE CONTROL REGISTER (TMOD)

Table 4

Timer/Counter Mode Control register (address 89H)

Table 5

Description of the TMOD bits

Table 6

TMOD M1 and M0 operating modes

76543210

TIMER 1

TIMER 0

GATE

C/TM1

GATE

C/TM1

BIT

SYMBOL

FUNCTION

TIMER 1

7GATE

Timer 1 gating control: when set, Timer/counter '1' is enabled only while 'INT1' pin is

HIGH and 'TR1' control bit is set. When cleared, Timer/counter '1' is enabled whenever

'TR1' control bit is set.

6C/T

Timer or counter selector: cleared for timer operation (input from internal system

clock). Set for counter operation (input from 'T1' input pin).

5M1

operating mode: see Table 6.

4M0

operating mode: see Table 6.

TIMER 0

3GATE

Timer 0 gating control: when set, Timer/counter '0' is enabled only while 'INT0' pin is

HIGH and 'TR0' control bit is set. When cleared, Timer/counter '0' is enabled whenever

'TR0' control bit is set.

2C/T

Timer or counter selector: cleared for timer operation (input from internal system

clock). Set for counter operation (input from 'T0' input pin).

1M1

operating mode: see Table 6.

0M0

operating mode: see Table 6.

FUNCTION

8-bit timer/counter: 'THx' with 5-bit prescaler.

16-bit timer/counter: 'THx' and 'TLx' are cascaded, there is no prescaler.

8-bit autoload timer/counter: 'THx' holds a value which is to be reloaded into 'TLx'

each time it overﬂows.

Timer 0: TL0 is an 8-bit timer/counter controlled by the standard Timer 0 control bits.

TH0 is an 8-bit timer controlled by Timer 1 control bits.

Timer 1: Timer/counter 1 stopped.

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