UPSD3422EB40U6 datasheet(251/293 Pages) STMICROELECTRONICS

251 / 293 page

uPSD34xx

PSD module

251/293

In PLD I/O mode, pins of Ports A, B, C, and D may also float during reset if no external

device is driving them, and if there is no equation specified for the DPLD or GPLD to make

them an output. In this case, a weak external pull-up resistor (100K

Ω minimum) should be

used on floating pins to avoid excessive current draw.

The pins on Ports 1, 3, and 4 of the 8032 MCU module do have weak internal pull-ups and

the inputs will not float, so no external pull-ups are needed.

Table 148.

Function status during power-up reset, warm reset, power-down mode

Note:

VM register Bit 7 (PIO_EN) and Bit 0 (SRAM in 8032 program space) are cleared to zero at

power-up and warm reset conditions.

28.6.1

JTAG ISP and JTAG debug

An IEEE 1149.1 serial JTAG interface is used on uPSD34xx devices for ISP (In-System

Programming) of the PSD module, and also for debugging firmware on the MCU Module.

IEEE 1149.1 Boundary Scan operations are not supported in the uPSD34xx.

The main advantage of JTAG ISP is that a blank uPSD34xx device may be soldered to a

circuit board and programmed with no involvement of the 8032, meaning that no 8032

Port Configuration

Power-Up Reset

Warm Reset

APD Power-down

Mode

MCU I/O

Pins are in input mode

Pin logic state is

unchanged

PLD I/O

Pin logic is valid after

internal PSD Module

configuration bits are

loaded. Happens long

before RST is de-

asserted

Pin logic is valid and is

determined by PLD

logic equations

Pin logic depends on

inputs to PLD (8032

addresses are blocked

from reaching PLD

inputs during power-

down mode)

Latched Address Out

Mode

Pins are High

Impedance

Pins are High

Impedance

Pins logic state not

defined since 8032

address signals are

blocked

Peripheral I/O Mode

Pins are High

Impedance

Pins are High

Impedance

Pins are High

Impedance

JTAG ISP and Debug

JTAG channel is active

and available

JTAG channel is active

and available

JTAG channel is active

and available

Power-Up Reset

Warm Reset

APD Power-down

Mode

PMMR0 and PMMR2

Cleared to 00h

Unchanged

Output of OMC Flip-

flops

Cleared to ’0’

Depends on .re and .pr

equations

Depends on .re and .pr

equations

VM Register(1)

Initialized with value

that was specified in

PSDsoft

Initialized with value

that was specified in

PSDsoft

Unchanged

All other csiop registers

Cleared to 00h

Unchanged

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