W79E825A Datasheet, PDF (22/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
Continued
BIT NAME
5 TF0
4 TR0
3 IE1
2 IT1
1 IE0
0 IT0
FUNCTION
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.
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.
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.
TIMER MODE CONTROL
Bit: 7
6
5
4
3
2
1
0
GATE
C/ T
M1
M0
GATE
C/ T
M1
M0
TIMER1
TIMER0
Mnemonic: TMOD
Address: 89h
BIT NAME
FUNCTION
Gating control: When this bit is set, Timer/counter 1 is enabled only while the INT1
7 GATE _{pin is high and the TR1 control bit is set. When cleared, the INT1 pin has no effect,}
and Timer 1 is enabled whenever TR1 control bit is set.
6
C/ T
Timer or Counter Select: When clear, Timer 1 is incremented by the internal clock.
When set, the timer counts falling edges on the T1 pin.
5 M1
4 M0
Timer 1 mode select bit 1. See table below.
Timer 1 mode select bit 0. See table below.
Gating control: When this bit is set, Timer/counter 0 is enabled only while the INT0
3 GATE _{pin is high and the TR0 control bit is set. When cleared, the INT0 pin has no effect,}
and Timer 0 is enabled whenever TR0 control bit is set.
2
C/ T
Timer or Counter Select: When clear, Timer 0 is incremented by the internal clock.
When set, the timer counts falling edges on the T0 pin.
1 M1 Timer 0 mode select bit 1. See table below.
0 M0 Timer 0 mode select bit 0. See table below.
- 22 -