PSD4235G2V-10UI datasheet(65/100 Pages) STMICROELECTRONICS

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PSD4256G6V

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

Port Data Registers

The Port Data Registers, shown in Table 47, are

used by the MCU to write data to or read data from

the ports. Table 47 shows the register name, the

ports having each register type, and MCU access

for each register type. The registers are described

next.

Data In

Port pins are connected directly to the Data In buff-

er. In MCU I/O Input mode, the pin input is read

through the Data In buffer.

Data Out Register

Stores output data written by the MCU in the MCU

I/O Output mode. The contents of the Register are

driven out to the pins if the Direction Register or

the output enable product term 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 lo-

cation 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, writ-

ing to the Macrocell loads data to the Macrocell

flip-flops. See the section entitled “I/O PORTS”, on

page 58.

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.

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 the section en-

titled “Input Macrocells (IMC)”, on page 45.

Table 47. 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

Mask Macrocell

A, B

WRITE/READ – prevents loading into a given

Macrocell

Input Macrocell

A, B, C

READ – outputs of the Input Macrocells

Enable Out

A, B, C, F

READ – the output enable control of the port driver

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