ST20-GP1 datasheet(86/116 Pages) STMICROELECTRONICS

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ST20-GP1

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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

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.

PIO port base address + #10

Read only

Bit

Bit ﬁeld

Function

PIn0

Input data bit 0

PIn1

Input data bit 1

PIn2

Input data bit 2

PIn3

Input data bit 3

PIn4

Input data bit 4

PIn5

Input data bit 5

Table 14.2 PIn register format

PC1

PIO port base address + #30

Read/Write

Bit

Bit ﬁeld

Function

ConﬁgData0

Conﬁgures the PIO bit 0 as an input or an output.

ConﬁgData1

Conﬁgures the PIO bit 1 as an input or an output.

ConﬁgData2

Conﬁgures the PIO bit 2 as an input or an output.

ConﬁgData3

Conﬁgures the PIO bit 3 as an input or an output.

ConﬁgData4

Conﬁgures the PIO bit 4 as an input or an output.

ConﬁgData5

Conﬁgures the PIO bit 5 as an input or an output.

Table 14.3 PC1 register format

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