PSD4235G2V-10UI datasheet(60/100 Pages) STMICROELECTRONICS

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

MCU I/O Mode

In the MCU I/O mode, the MCU uses the PSD

Ports to expand its own I/O ports. By setting up the

CSIOP space, the ports on the PSD are mapped

into the MCU address space. The addresses of

the ports are listed in Table 6, page 19.

A port pin can be put into MCU I/O mode by writing

a 0 to the corresponding bit in the Control Register

(for Ports E, F and G). The MCU I/O direction may

be changed by writing to the corresponding bit in

the Direction Register, or by the output enable

product term. See the section entitled “Port Oper-

ating Modes”, on page 58. When the pin is config-

ured as an output, the content of the Data Out

put, the MCU can read the port input through the

Data In buffer. See Figure 27, page 59.

Ports A, B and C do not have Control Registers,

and are in MCU I/O mode by default. They can be

used for PLD I/O if they are specified in PSDsoft.

PLD I/O Mode

The PLD I/O Mode uses a port as an input to the

CPLD’s Input Macrocells (IMC), and/or as an out-

put from the CPLD’s Output Macrocells (OMC).

The output can be tri-stated with a control signal.

This output enable control signal can be defined

by a product term from the PLD, or by resetting the

corresponding bit in the Direction Register to 0.

The corresponding bit in the Direction Register

must not be set to 1 if the pin is defined for a PLD

input signal in PSDsoft. The PLD I/O mode is

specified in PSDsoft by declaring the port pins,

and then specifying an equation in PSDsoft.

Address Out Mode

For MCUs with a multiplexed address/data bus,

Address Out mode can be used to drive latched

addresses onto the port pins. These port pins can,

in turn, drive external devices. Either the output

enable or the corresponding bits of both the Direc-

tion Register and Control Register must be set to

a 1 for pins to use Address Out mode. This must

be done by the MCU at run-time. See Table 41,

page 61 for the address output pin assignments on

Ports E, F and G for various MCUs.

Note: Do not drive address signals with Address

Out Mode to an external memory device if it is in-

tended for the MCU to Boot from the external de-

vice. The MCU must first Boot from PSD memory

so the Direction and Control register bits can be

set.

Table 39. Port Operating Modes

Note: 1. Can be multiplexed with other I/O functions.

2. Available to Motorola 16-bit 683xx and HC16 families of MCUs.

Port Mode

Port A

Port B

Port C

Port D

Port E

Port F

Port G

MCU I/O

Yes

PLD I/O

McellA Outputs

McellB Outputs

Additional Ext. CS Outputs

PLD Inputs

Yes

Address Out

Yes (A7 –

or (A15 – 8)

Address In

Yes

Data Port

Yes

Peripheral I/O

Yes

JTAG ISP

Yes1

MCU RESET Mode2

Yes

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