UPSD325X datasheet(108/176 Pages) STMICROELECTRONICS

108 / 176 page

µPSD325X DEVICES

108/176

Instructions

An instruction consists of a sequence of specific

operations. Each received byte is sequentially de-

coded by the PSD MODULE and not executed as

a standard WRITE operation. The instruction is ex-

ecuted when the correct number of bytes are prop-

erly

received

and

the

time

between

two

consecutive bytes is shorter than the time-out pe-

riod. Some instructions are structured to include

READ operations after the initial WRITE opera-

tions.

The instruction must be followed exactly. Any in-

valid combination of instruction bytes or time-out

between two consecutive bytes while addressing

Flash memory resets the device logic into READ

Mode (Flash memory is read like a ROM device).

The Flash memory supports the instructions sum-

marized in Table 85:

Flash memory:

Erase memory by chip or sector

Suspend or resume sector erase

Program a Byte

RESET to READ Mode

Read primary Flash Identifier value

Read Sector Protection Status

Bypass

These instructions are detailed in Table 85. For ef-

ficient decoding of the instructions, the first two

bytes of an instruction are the coded cycles and

are followed by an instruction byte or confirmation

byte. The coded cycles consist of writing the data

AAh to address X555h during the first cycle and

data 55h to address XAAAh during the second cy-

cle. Address signals A15-A12 are Don’t Care dur-

ing the instruction WRITE cycles. However, the

appropriate

Sector

Select

(FS0-FS7

CSBOOT0-CSBOOT3) must be selected.

The primary and secondary Flash memories have

the same instruction set (except for Read Primary

Flash Identifier). The Sector Select signals deter-

mine which Flash memory is to receive and exe-

cute the instruction. The primary Flash memory is

selected if any one of Sector Select (FS0-FS7) is

High, and the secondary Flash memory is selected

any

one

Sector

Select

(CSBOOT0-

CSBOOT3) is High.

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