PSD813F2 datasheet(31/128 Pages) STMICROELECTRONICS

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PSD8XXFX

Instructions

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cycle that is currently in progress. Lastly, the MCU may use instructions to read special data

from these memory blocks. The following sections describe these READ functions.

7.3

Read memory contents

Primary Flash memory and secondary Flash memory are placed in the READ mode after

Power-up, chip reset, or a Reset Flash instruction (see Table 10). The MCU can read the

memory contents of the primary Flash memory or the secondary Flash memory by using

READ operations any time the READ operation is not part of an instruction.

7.4

Read Primary Flash Identifier

The primary Flash memory identifier is read with an instruction composed of 4 operations: 3

specific WRITE operations and a READ operation (see Table 10). During the READ

operation, address bits A6, A1, and A0 must be '0,0,1,' respectively, and the appropriate

Sector Select (FS0-FS7) must be high. The identifier for the PSD813F2/3/4/5 is E4h, and for

the PSD83xF2 or PSD85xF2 it is E7h.

7.5

Read Memory Sector Protection status

The primary Flash memory Sector Protection Status is read with an instruction composed of

4 operations: 3 specific WRITE operations and a READ operation (see Table 10). During the

READ operation, address Bits A6, A1, and A0 must be '0,1,0,' respectively, while Sector

Select (FS0-FS7 or CSBOOT0-CSBOOT3) designates the Flash memory sector whose

protection has to be verified. The READ operation produces 01h if the Flash memory sector

is protected, or 00h if the sector is not protected.

The sector protection status for all NVM blocks (primary Flash memory or secondary Flash

memory) can also be read by the MCU accessing the Flash Protection registers in PSD I/O

space. See Section 10.1: Flash Memory Sector Protect for register definitions.

7.6

Reading the Erase/Program Status bits

The PSD provides several status bits to be used by the MCU to confirm the completion of an

Erase or Program cycle of Flash memory. These status bits minimize the time that the MCU

spends performing these tasks and are defined in Table 11. The status bits can be read as

many times as needed.

For Flash memory, the MCU can perform a READ operation to obtain these status bits while

an Erase or Program instruction is being executed by the embedded algorithm. See

Section 8: Programming Flash memory for details.

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