參數(shù)資料
型號(hào): W78IRD2A
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁(yè)數(shù): 9/76頁(yè)
文件大?。?/td> 646K
代理商: W78IRD2A
W78IRD2/W78IRD2A
Publication Release Date: February 14, 2007
- 9 -
Revision A9
Port 0
Bit:
7
6
5
4
3
2
1
0
P0.7
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
Mnemonic: P0 Address: 80h
Port 0 is an open-drain, bi-directional I/O port after chip is reset. Besides, it has internal pull-up
resisters enabled by setting P0UP of POPT (86H) to high. This port also provides a multiplexed, low-
order address/data bus when the W78IRD2 accesses external memory.
Stack Pointer
Bit:
7
6
5
4
3
2
1
0
SP.7
SP.6
SP.5
SP.4
SP.3
SP.2
SP.1
SP.0
Mnemonic: SP Address: 81h
The Stack Pointer stores the RAM address (scratchpad RAM, not AUX-RAM) where the stack begins.
It always points to the top of the stack.
Data Pointer Low
Bit:
7
6
5
4
3
2
1
0
DPL.7
DPL.6
DPL.5
DPL.4
DPL.3
DPL.2
DPL.1
DPL.0
Mnemonic: DPL Address: 82h
This is the low byte of the standard-8052 16-bit data pointer.
Data Pointer High
Bit:
7
6
5
4
3
2
1
0
DPH.7
DPH.6
DPH.5
DPH.4
DPH.3
DPH.2
DPH.1
DPH.0
Mnemonic: DPH Address: 83h
This is the high byte of the standard-8052 16-bit data pointer.
Port 4.0 Low-Address Comparator
Bit:
7
6
5
4
3
2
1
0
P40AL.7 P40AL.6 P40AL.5 P40AL.4 P40AL.3 P40AL.2 P40AL.1 P40AL.0
Mnemonic: P40AL Address: 84h
Port 4.0 High-Address Comparator
Bit:
7
6
5
4
3
2
1
0
P40AH.7 P40AH.6 P40AH.5 P40AH.4 P40AH.3 P40AH.2 P40AH.1 P40AH.0
Mnemonic: P40AH Address: 85h
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