w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 13

• Manufacturer Part Number: w77e58
• Description: 8 Bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

This is the low byte of the new additional 16-bit data pointer that has been added to the W77E58. The
user can switch between DPL, DPH and DPL1, DPH1 simply by setting register DPS = 1. The
instructions that use DPTR will now access DPL1 and DPH1 in place of DPL and DPH. If they are not
required they can be used as conventional register locations by the user.
DATA POINTER HIGH1
This is the high byte of the new additional 16-bit data pointer that has been added to the W77E58.
The user can switch between DPL, DPH and DPL1, DPH1 simply by setting register DPS = 1. The
instructions that use DPTR will now access DPL1 and DPH1 in place of DPL and DPH. If they are not
required they can be used as conventional register locations by the user.
DATA POINTER SELECT
DPS.0: This bit is used to select either the DPL,DPH pair or the DPL1,DPH1 pair as the active Data
DPS.1-7:These bits are reserved, but will read 0.
POWER CONTROL
SMOD : This bit doubles the serial port baud rate in mode 1, 2, and 3 when set to 1.
SMOD0: Framing Error Detection Enable: When SMOD0 is set to 1, then SCON.7(SCON1.7)
GF1-0: These two bits are general purpose user flags.
PD:
IDL:
Pointer. When set to 1, DPL1, DPH1 will be selected, otherwise DPL,DPH will be selected.
Setting this bit causes the W77E58 to go into the POWER DOWN mode. In this mode all the
clocks are stopped and program execution is frozen.
Setting this bit causes the W77E58 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.
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 8052 function.
Mnemonic: DPH1
Mnemonic: DPS
Mnemonic: PCON
Bit:
Bit:
Bit:
DPH1.7 DPH1.6 DPH1.5 DPH1.4 DPH1.3 DPH1.2 DPH1.1 DPH1.0
SM0D
7
7
7
-
SMOD0
6
6
6
-
- 13 -
5
5
5
-
-
4
4
4
-
-
Preliminary W77E58
Publication Release Date: March 1999
GF1
3
3
3
-
Address: 85h
Address: 86h
Address: 87h
GF0
2
2
2
-
PD
1
1
1
-
Revision A1
DPS.0
IDL
0
0
0