PSD4235G2-12UT datasheet(83/124 Pages) STMICROELECTRONICS

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PSD4235G2V

I/O ports

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19.14

Port Data registers

The Port Data registers, shown in Table 46, are used by the MCU to write data to or read

data from the ports. Table 46 shows the register name, the ports having each register type,

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

19.15

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.

19.16

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.

19.17

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 Mask macrocell register bits

are not set, writing to the macrocell loads data to the macrocell flip-flops (see Figure 13:

Macrocell and I/O port).

19.18

Mask macrocell register

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

the Mask macrocell 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.

19.19

Input macrocells (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 17.6: Input macrocells (IMC)).

Table 46.

Port Data registers

Port

MCU Access

Data In

A, B, C, D, E, F,

READ - input on pin

Data Out

A, B, C, D, E, F,

WRITE/READ

Output macrocell

A, B

READ - outputs of macrocells

WRITE - loading macrocells Flip-flop

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