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HD6433846XXXH 参数 Datasheet PDF下载

HD6433846XXXH图片预览
型号: HD6433846XXXH
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器\n [Microcontroller ]
分类和应用: 微控制器外围集成电路时钟
文件页数/大小: 524 页 / 1465 K
品牌: ETC [ ETC ]
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8.11  
Port A  
8.11.1  
Overview  
Port A is a 4-bit I/O port, configured as shown in figure 8-10.  
PA3/COM4  
PA2/COM3  
PA1/COM2  
PA0/COM1  
Port A  
Figure 8-10 Port A Pin Configuration  
Register Configuration and Description  
8.11.2  
Table 8-29 shows the port A register configuration.  
Table 8-29 Port A Registers  
Name  
Abbrev.  
PDRA  
R/W  
R/W  
W
Initial Value  
H'F0  
Address  
H'FFDD  
H'FFED  
Port data register A  
Port control register A  
PCRA  
H'F0  
1. Port data register A (PDRA)  
Bit  
7
1
6
1
5
1
4
1
3
2
1
0
PA3  
0
PA2  
0
PA1  
0
PA 0  
0
Initial value  
Read/Write  
R/W  
R/W  
R/W  
R/W  
PDRA is an 8-bit register that stores data for port A pins PA3 to PA0. If port A is read while  
PCRA bits are set to 1, the values stored in PDRA are read, regardless of the actual pin states. If  
port A is read while PCRA bits are cleared to 0, the pin states are read.  
Upon reset, PDRA is initialized to H'F0.  
171  
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