PSD813F2 datasheet(74/128 Pages) STMICROELECTRONICS

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I/O ports

PSD8XXFX

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Doc ID 7833 Rev 7

16.14

Port Data registers

The port Data registers, shown in Table 28, are used by the MCU to write data to or read

data from the ports. Table 28 shows the register name, the ports having each register type,

and MCU access for each register type. The registers are described below.

16.15

Data In

Port pins are connected directly to the Data In buffer. In MCU I/O input mode, the pin input is

read through the Data In buffer.

16.16

Data Out register

Stores output data written by the MCU in the MCU I/O output mode. The contents of the

is set to ’1.’ The contents of the register can also be read back by the MCU.

Output macrocells (OMC)

The CPLD Output macrocells (OMC) occupy a location in the MCU’s address space. The

MCU can read the output of the Output macrocells (OMC). If the OMC Mask register bits are

not set, writing to the macrocell loads data to the macrocell flip-flops (see Section 14:

PLDS).

16.17

OMC Mask register

Each OMC Mask register bit corresponds to an Output macrocell (OMC) flip-flop. When the

OMC Mask register bit is set to a 1, loading data into the Output macrocell (OMC) flip-flop is

blocked. The default value is 0 or unblocked.

16.18

Input macro (IMC)

The input macrocells (IMC) can be used to latch or store external inputs. The outputs of the

input macrocells (IMC) are routed to the PLD input bus, and can be read by the MCU (see

Section 14: PLDS).

Table 28.

Port Data registers

Port

MCU access

Data In

A,B,C,D

READ – input on pin

Data Out

A,B,C,D

WRITE/READ

Output macrocell

A,B,C

READ – outputs of macrocells

WRITE – loading macrocells flip-flop

Mask macrocell

A,B,C

WRITE/READ – prevents loading into a given

macrocell

Input macrocell

A,B,C

READ – outputs of the input macrocells

Enable Out

A,B,C

READ – the output enable control of the port driver

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