w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 28

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

8.
8.1
8.2
8.3
8.4
8.5
8051 AND BASIC CONTROL REGISTER
Bit:
Bit:
Stack Pointer
Data Pointer Low
Data Pointer High
Data Pointer Low1
Data Pointer High1
The Stack Pointer stores the Scratch-pad RAM address where the stack begins. In other words
it always points to the top of the stack.
This is the low byte of the standard 8032 16-bit data pointer.
This is the high byte of the standard 8032 16-bit data pointer.
This is the low byte of the new additional 16-bit data pointer that has been added to the
Winbond Keyboard controller. The user can switch between DPL, DPH and DPL1, DPH1
simply by setting DPS = 1. The instructions that use DPTR will now access DPL1 and DPH1 in
place of DPL and DPH.
This is the high byte of the new additional 16-bit data pointer that has been added to the
Winbond Keyboard controller. The user can switch between DPL, DPH and DPL1, DPH1
simply by setting DPS = 1. The instructions that use DPTR will now access DPL1 and DPH1 in
place of DPL and DPH.
Bit:
Bit:
Bit:
DPH1.7
DPL1.7
Mnemonic: SP
Mnemonic: DPL
Mnemonic: DPH
Mnemonic: DPH1
7
7
Mnemonic: DPL1
DPH.7
DPL.7
SP.7
7
7
7
DPH1.6
DPL1.6
6
6
DPH.6
DPL.6
SP.6
6
6
6
DPH1.5
DPL1.5
5
5
DPH.5
DPL.5
SP.5
5
5
5
DPH1.4
DPL1.4
- 19 -
4
4
DPH.4
DPL.4
SP.4
4
4
4
Address: 81h
Address: 82h
DPH1.3
DPL1.3
Publication Release Date: June 23, 2003
Address: 83h
Address: 85h
3
3
DPH.3
DPL.3
SP.3
3
3
3
Address: 84h
DPH1.2
DPL1.2
DPH.2
DPL.2
2
2
SP.2
2
2
2
W83L950D
DPH1.1
DPL1.1
DPH.1
DPL.1
SP.1
1
1
1
1
1
Revision 1.0
DPH1.0
DPL1.0
DPH.0
DPL.0
SP.0
0
0
0
0
0