W78ERD2 Datasheet, PDF (12/72 Pages) Winbond – 8-BIT MICROCONTROLLER

W78ERD2
Continued
BIT NAME
5
-
4 POF
3 GF1
2 GF0
1 PD
0 IDL
FUNCTION
Reserve
0: Cleared by software.
1: Set automatically when a power-on reset has occurred.
These two bits are general purpose user flags.
These two bits are general purpose user flags.
1: Setting this bit causes the Chip to go into the POWER DOWN mode. In this
mode all the clocks are stopped and program execution is frozen.
1: Setting this bit causes the Chip to go into the IDLE mode. In this mode the clocks
to the CPU are stopped, so program execution is frozen. But the clock to the
serial, timer and interrupt blocks is not stopped, and these blocks continue
operating.
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
Timer 1 overflow flag: This bit is set when Timer 1 overflows. It is cleared
7 TF1 automatically when the program does a timer 1 interrupt service routine. Software
can also set or clear this bit.
6
TR1
Timer 1 run control: This bit is set or cleared by software to turn timer/counter on or
off.
Timer 0 overflow flag: This bit is set when Timer 0 overflows. It is cleared
5 TF0 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: Set by hardware when an edge/level is detected on INT1 .
3 IE1 _{This bit is cleared by hardware when the service routine is vectored to only if the}
interrupt was edge triggered. Otherwise it follows the pin.
2
IT1
Interrupt 1 type control: Set/cleared by software to specify falling edge/ low level
triggered external inputs.
Interrupt 0 Edge Detect: Set by hardware when an edge/level is detected on INT0 .
1
IE0 _{This bit is cleared by hardware when the service routine is vectored to only if the}
interrupt was edge triggered. Otherwise it follows 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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