P83CE558EBBSLASHYYY datasheet(23/72 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

P83CE558/P80CE558/P89CE558

Single-chip 8-bit microcontroller

1996 Aug 06

Figure 20. Timer/Counter mode control (TCON) register.

TCON (88H)

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

Table 14.

Description of TCON bits

SYMBOL

BIT

FUNCTION

TF1

TCON.7

Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor

vectors to interrupt routine.

TR1

TCON.6

Timer 1 run control bit. Set/cleared by software to turn Timer/Counter on/off.

TF0

TCON.5

Timer 0 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor

vectors to interrupt routine.

TR0

TCON.4

Timer 0 run control bit. Set/cleared by software to turn Timer/Counter on/off.

IE1

TCON.3

Interrupt 1 edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt

processed.

IT1

TCON.2

Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.

IE0

TCON.1

Interrupt 0 edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt

processed.

IT0

TCON.0

Interrupt 0 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.

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