W79E225A_08 Datasheet, PDF (29/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
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
6 TR1
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.
5 TF0
4 TR0
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.
Timer 0 Run Control. This bit is set or cleared by software to turn timer/counter
on or off.
3 IE1
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.
2 IT1
1 IE0
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.
0 IT0
Interrupt 0 Type Control: Set/cleared by software to specify falling edge/ low
level triggered external inputs.
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Publication Release Date: April 15, 2008
Revision A4.0