參數(shù)資料
型號: C515C
廠商: SIEMENS AG
元件分類: 8位微控制器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁數(shù): 37/96頁
文件大?。?/td> 1285K
代理商: C515C
C515C
Data Sheet
33
2003-02
Port Structure Selection of Port 5
After a reset operation of the C515C, the quasi-bidirectional 8051-compatible port
structure is selected. For selection of the bidirectional (CMOS) port 5 structure the bit
PMOD of SFR SYSCON must be set. Because each port 5 pin can be programmed as
an input or an output, additionally, after the selection of the bidirectional mode the
direction register DIR5 of port 5 must be written. This direction register is mapped to the
port 5 register. This means, the port register address is equal to its direction register
address.
Figure 10
illustrates the port and direction register configuration.
Figure 10
Port Register, Direction Register
MCS02649
D
R
Q
Q
Int. Bus, Bit 7
Write to IP 1
Delay:
2.5 Machine Cycles
Port Register
Direction Register
Enable
PDIR
Enable
Write to Port
Read Port
Internal
Bus
Instruction sequence for the programming of the direction registers:
ORL IP1, #80H ; Set bit PDIR
#OYYH
DIRx,
MOV
Write port x direction register with value YYH
;
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