W79E804A/803A/802A
BIT
NAME
FUNCTION
7-0
DPH.[7:0]
This is the high byte of the standard 8052 16-bit data pointer.
This is the high byte of the DPTR 16-bit data pointer.
POWER CONTROL
Bit:
7
SMOD
6
SMOD0
5
BOF
4
POR
3
GF1
2
GF0
1
PD
0
IDL
Mnemonic: PCON
BIT
NAME
FUNCTION
Address: 87h
7
SMOD
1: This bit doubles the serial port baud rate in mode 1, 2, and 3.
0: Framing Error Detection Disable. SCON.7 (SM0/FE) bit is used as SM0
(standard 8052 function).
1: Framing Error Detection Enable. SCON.7 (SM0/FE) bit is used to reflect as
Frame Error (FE) status flag.
0: Cleared by software.
1: Set automatically when a brownout reset or interrupt has occurred. Also set at
power on.
0: Cleared by software.
1: Set automatically when a power-on reset has occurred.
General purpose user flags.
General purpose user flags.
1: The CPU goes into the POWER DOWN mode. In this mode, all the clocks are
stopped and program execution is frozen.
1: The CPU goes into the IDLE mode. In this mode, the clocks CPU clock stopped,
so program execution is frozen. But the clock to the serial, timer and interrupt
blocks is not stopped, and these blocks continue operating.
6
SMOD0
5
BOF
4
3
2
1
0
POR
GF1
GF0
PD
IDL
TIMER CONTROL
Bit:
7
TF1
6
TR1
5
TF0
4
TR0
3
IE1
2
IT1
1
IE0
0
IT0
Mnemonic: TCON
BIT
NAME
FUNCTION
Address: 88h
7
6
5
TF1
TR1
TF0
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.
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.
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