參數(shù)資料
型號: ST20GP1
英文描述: MAX 7000 CPLD 256 MC 208-PQFP
中文描述: GPS處理器
文件頁數(shù): 86/116頁
文件大小: 1107K
代理商: ST20GP1
ST20-GP1
86/116
PIn register
The data read from this register will give the logic level present on an input pin at the start of the
read cycle to this register. The read data will be the last value written to the register irrespective of
the pin configuration selected.
14.1.2 PIO bit configuration register
The
PC1
register is used to configure each of the PIO port bits as an input or output. Writing a 0
configures the bit as an input, a 1 configures the bit as an output.
14.1.3 PIO Input compare and Compare mask registers
The input compare (
PComp
) register holds the value to which the input data from the PIO port pins
will be compared. If any of the input bits are different from the corresponding bits in the
PComp
register, and the corresponding bit in the compare mask (
PMask
) register is set to 1, then the
internal interrupt signal for the port will be set to 1.
The compare function is sensitive to changes in levels on the pins and so the change in state on
the input pin must be greater in duration than the interrupt response time for the compare to be
seen as a valid interrupt by an interrupt service routine.
PIn
PIO port base address + #10
Read only
Bit
Bit field
Function
0
PIn0
Input data bit 0
1
PIn1
Input data bit 1
2
PIn2
Input data bit 2
3
PIn3
Input data bit 3
4
PIn4
Input data bit 4
5
PIn5
Input data bit 5
Table 14.2
PIn
register format
PC1
PIO port base address + #30
Read/Write
Bit
Bit field
Function
0
ConfigData0
Configures the PIO bit 0 as an input or an output.
1
ConfigData1
Configures the PIO bit 1 as an input or an output.
2
ConfigData2
Configures the PIO bit 2 as an input or an output.
3
ConfigData3
Configures the PIO bit 3 as an input or an output.
4
ConfigData4
Configures the PIO bit 4 as an input or an output.
5
ConfigData5
Configures the PIO bit 5 as an input or an output.
Table 14.3
PC1
register format
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