P8XC557E4 NXP Semiconductors, P8XC557E4 Datasheet - Page 23

• Manufacturer Part Number: P8XC557E4
• Description: The P80C557E4/P83C557E4/P89C557E4 (hereafter generically referred to as P8xC557E4) single-chip 8-bit microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 14. Description of TCON bits
1999 Mar 02
Single-chip 8-bit microcontroller
SYMBOL
TR1
TR0
TF1
TF0
IE1
IT1
IE0
IT0
TCON (88H)
TCON.7
TCON.6
TCON.5
TCON.4
TCON.3
TCON.2
TCON.1
TCON.0
BIT
TF1
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor
vectors to interrupt routine.
Timer 1 run control bit. Set/cleared by software to turn Timer/Counter on/off.
Timer 0 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor
vectors to interrupt routine.
Timer 0 run control bit. Set/cleared by software to turn Timer/Counter on/off.
Interrupt 1 edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt
processed.
Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
Interrupt 0 edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt
processed.
Interrupt 0 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
7
Figure 20. Timer/Counter mode control (TCON) register.
TR1
6
TF0
5
23
TR0
4
P83C557E4/P80C557E4/P89C557E4
FUNCTION
IE1
3
IT1
2
IE0
1
Product specification
IT0
0