ST20-GP6 datasheet(95/123 Pages) STMICROELECTRONICS

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ST20-GP6

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16.1.2 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.

16.1.3 PIO Input compare and Compare mask registers

The Input compare register (

PComp) holds the value to which the input data from the PIO ports

pins will be compared. If any of the input bits are different from the corresponding bits in the

PComp register and the corresponding bit position in the PIO Compare mask register (PMask)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.

Note that the compare function is operational in all conﬁgurations for a PIO bit including the alter-

nate function modes.

PC1

PIO port base address + #30

Read/Write

Bit

Bit ﬁeld

Function

7:0

ConﬁgData7:0

Conﬁgures the PIO bit as an input or an output.

input

output

Table 16.3

PC1 register format

PComp

PIO base address + #50

Read/Write

Bit

Bit ﬁeld

Function

7:0

PComp7:0

Bit 0 to 7 value to which the input data from the PIO port pins will be

compared.

Table 16.4

PComp register format - 1 register per port

PMask

PIO base address + #60

Read/Write

Bit

Bit ﬁeld

Function

7:0

PMask7:0

When set to 1, the compare function for the internal interrupt for the port is

enabled. If the respective bit (0 to 7) of the input is different to the respective

PComp7:0 bit in the PComp register, then an interrupt is generated.

Table 16.5

PMask register format

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