ST20-GP6 datasheet(94/123 Pages) STMICROELECTRONICS

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ST20-GP6

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16 Parallel input/output

The ST20-GP6 device has 16 bits of Parallel Input/Output (PIO), conﬁgured in groups (ports) of

eight bits. Each bit is programmable as an output, an input, or a bidirectional pin.

Each group of eight input bits can also be compared against a register and an interrupt generated

when the value is not equal.

Each of the groups of eight bits operates as described in the following section.

16.1 PIO Ports0-1

Each of the eight bits of a PIO port has a corresponding bit in the PIO registers associated with

each port. These registers hold: output data for the port (

POut); the input data read from the pin

(

PIn); PIO bit conﬁguration register (PC1); and the two input compare function registers (PComp

and

PMask).

All of the registers, except the

PIn registers, are each mapped onto two additional addresses so

that bits can be set or cleared individually.

The

Set_ register allows bits to be set individually. Writing a ‘1’ in this register sets the correspond-

ing bit in the associated register, a ‘0’ leaves the bit unchanged.

The

Clear_ register allows bits to be cleared individually. Writing a ‘1’ in this register resets the cor-

responding bit in the associated register, a ‘0’ leaves the bit unchanged.

16.1.1 PIO Data registers

The base addresses for the

PIO registers are given in the memory map.

Note that during reset all the registers are reset to '00000000'.

POut register

This register holds output data for the port.

PIn register

The data read from this register will give the logic level present on an input pin of the port at the

start of the read cycle to this register. The read data will be the last value written to the register

regardless of the pin conﬁguration selected.

POut

PIO base address + #00

Read/Write

Bit

Bit ﬁeld

Function

7:0

POut7:0

Bits 0 to 7 of output data for the port.

Table 16.1

POut register format - 1 register per port

PIO base address + #10

Read only

Bit

Bit ﬁeld

Function

7:0

PIn7:0

Bits 0 to 7 of input data for the port.

Table 16.2

PIn register format - 1 register per port

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