參數(shù)資料
型號: 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
文件頁數(shù): 27/76頁
文件大?。?/td> 646K
代理商: W78IRD2A
W78IRD2/W78IRD2A
Publication Release Date: February 14, 2007
- 27 -
Revision A9
Continued
BIT
NAME
FUNCTION
2
-
Reserved
1
-
Reserved
0
MD
Stretch MOVX select bits: This bit is used to select the stretch value for the MOVX
instruction, which enables the microcontroller to access slower memory devices or
peripherals transparently and without the need for external circuits. The RD or WR
strobe and all internal timings are stretched by the selected interval. The default
value is 1 cycle. For faster access, set the value to 0.
CKCON has an unrestricted read access, however, the write access is protected by timed-access
protection. See the section of timed-access protection for more information.
Accumulator
Bit:
7
6
5
4
3
2
1
0
ACC.7
ACC.6
ACC.5
ACC.4
ACC.3
ACC.2
ACC.1
ACC.0
Mnemonic: ACC Address: E0h
ACC.7-0: The A (or ACC) register is the standard 8052 accumulator.
Port 4
Bit:
7
6
5
4
3
2
1
0
-
-
-
-
P4.3/INT2 P4.2/INT3
P4.1
P4.0
Mnemonic: ACC Address: E8h
P4.3-0: Port 4 is a bi-directional I/O port with internal pull-ups.
BIT
NAME
FUNCTION
7 – 4
-
Reserved
3
P4.3
Port 4 Data bit which outputs to pin P4.3 in mode 0, or external interrupt
INT2
.
2
P4.2
Port 4 Data bit which outputs to pin P4.2 in mode 0, or external interrupt
INT3
.
1
P4.1
Port 4 Data bit which outputs to pin P4.1 in mode 0.
0
P4.0
Port 4 Data bit which outputs to pin P4.0 in mode 0.
PCA Counter Low Register
Bit:
7
6
5
4
3
2
1
0
CL.7
CL.6
CL.6
CL.4
CL.3
CL.2
CL.1
CL.0
Mnemonic: CL Address: E9h
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