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參數資料
型號: W741C20X
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4位微控制器
文件頁數: 19/84頁
文件大小: 486K
代理商: W741C20X
Preliminary W741C20X
Publication Release Date: March 1998
- 19 -
Revision A3
Bit 0 = 1 Signal change at RC.0
Bit 1 = 1 Signal change at RC.1
Bit 2 = 1 Signal change at RC.2
Bit 3 = 1 Signal change at RC.3
Reset
MOV PEF, #I
CLR PSR0
HCF.2
INT 2
Reset
CLR EVF, #I
EVF.2
HEF.2
IEF.2
dSignal
PEF.0
DATA BUS
PEF.3
Signal
PEF.1
Signal
PEF.2
Signal
D
ck
Q
R
PSR0.0
D
ck
Q
R
PSR0.1
D
ck
Q
R
PSR0.2
D
ck
Q
R
PSR0.3
D
ck
Q
R
RC.3
RC.2
RC.1
RC.0
SEF.0
SEF.3
SEF.1
SEF.2
edge
detector
edge
detector
edge
detector
edge
detector
Wake up from STOP mode
PM4.3
PM4.2
PM4.1
PM4.0
PM4.3
PM4.2
PM4.1
PM4.0
MOVA R, RC
Figure 10. Input Architecture of Ports RC
Output Port RE
Output port RE can be used as an output of the internal RT port, or as a serial input/output port. The
control flow is shown in Figure 8. When bit 1 of port mode 3 register (PM3) equals to 0, port RE works
as an output of internal port RT. When the MOV RE, R instruction is executed, the data in the RAM
will be output to port RT through port RE. When RE works as a parallel output port, it provides a high
sink current to drive LEDs. When bit 1 of PM3 equals to 1, the RE port works as a serial input/output
port, and RE.0 to RE.3 are used as DOUT, CLKO, DIN, and CLKI, respectively. In this case, the DIN
pin will has a built-in pull-high resistor. The serial I/O functions are controlled by the instructions SOP
R and SIP R. The functions of the two instructions are described below:
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