
Preliminary W79E225A/227A Data Sheet
Publication Release Date: December 14, 2007
- 29 -
Revision A2.0
TIMER CONTROL
Bit:
7
6
5
4
3
2
1
0
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
Mnemonic: TCON
Address: 88h
BIT
NAME
FUNCTION
7
TF1
Timer 1 Overflow Flag. This bit is set when Timer 1 overflows. It is cleared
automatically when the program does a timer 1 interrupt service routine.
Software can also set or clear this bit.
Timer 1 Run Control. This bit is set or cleared by software to turn timer/counter
on or off.
6
TR1
5
TF0
Timer 0 Overflow Flag. This bit is set when Timer 0 overflows. It is cleared
automatically when the program does a timer 0 interrupt service routine.
Software can also set or clear this bit.
4
TR0
Timer 0 Run Control. This bit is set or cleared by software to turn timer/counter
on or off.
Interrupt 1 Edge Detect Flag: Set by hardware when an edge/level is detected
on INT1. This bit is cleared by hardware when the service routine is vectored to
only if the interrupt was edge triggered. Otherwise it follows the inverse of the
pin.
3
IE1
2
IT1
Interrupt 1 Type Control. Set/cleared by software to specify falling edge/ low
level triggered external inputs.
Interrupt 0 Edge Detect Flag. Set by hardware when an edge/level is detected
on INT0. This bit is cleared by hardware when the service routine is vectored to
only if the interrupt was edge triggered. Otherwise it follows the inverse of the
pin.
Interrupt 0 Type Control: Set/cleared by software to specify falling edge/ low
level triggered external inputs.
1
IE0
0
IT0