W79E225A_08 Datasheet, PDF (28/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
DATA POINTER HIGH
Bit:
7
6
5
4
3
2
1
DPH.7
DPH.6
DPH.5
DPH.4
DPH.3
DPH.2
DPH.1
Mnemonic: DPH
This is the high byte of the standard 8032 16-bit data pointer.
Address: 83h
TIMER 3 LSB
Bit:
7
6
5
4
3
2
1
TL3.7
TL3.6
TL3.5
TL3.4
TL3.3
TL3.2
TL3.1
Mnemonic: TL3
Address: 84h
BIT
NAME
FUNCTION
7-0 Timer 3 LSB
LSB of Timer3
0
DPH.0
0
TL3.0
TIMER 3 MSB
Bit:
7
6
5
4
TH3.7
TH3.6
TH3.5
TH3.4
Mnemonic: TH3
BIT
NAME
7-0 Timer 3 MSB
MSB of Timer3
3
2
1
TH3.3
TH3.2
TH3.1
Address: 85h
FUNCTION
0
TH3.0
POWER CONTROL
Bit:
7
6
5
4
3
2
1
0
SMOD SMOD0 -
-
GF1
GF0
PD
IDL
Mnemonic: PCON
Address: 87h
BIT NAME
FUNCTION
7 SMOD
This bit doubles the serial port baud rate in mode 1, 2, and 3 when set to 1.
Framing Error Detection Enable. When SMOD0 is set to 1, then SCON.7
6 SMOD0 (SCON1.7) now indicates a Frame Error and acts as the FE (FE_1) flag. When
SMOD0 is 0, then SCON.7 (SCON1.7) acts as per the standard 8032 function.
5-4 -
Reserved.
3-2 GF1-0
These two bits are general purpose user flags.
1 PD
Setting this bit causes the device to go into the POWERDOWN mode. In this
mode all the clocks are stopped and program execution is frozen.
0 IDL
Setting this bit causes the device to go into the IDLE mode. In this mode the
clock to the CPU is stopped, so program execution is frozen, but the clock to the
serial ports, timer, PWM, ADC, SPI and interrupt blocks is not stopped, and
these blocks continue operating unhindered.
- 28 -
Publication Release Date: April 15, 2008
Revision A4.0