PSD954F5V90UT データシートの表示（PDF） - STMicroelectronics

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PSD954F5V90UT

Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V

STMicroelectronics 

PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2

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 per-

forming these tasks and are defined in Table 10.

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 the section entitled

PROGRAMMING FLASH MEMORY, page 25 for

details.

Table 10. Status Bit

Functional Block

FS0-FS7/CSBOOT0-

CSBOOT3

DQ7

DQ6

DQ5

Flash Memory

VIH

Data Toggle Error

Polling Flag Flag

Note: 1. X = Not guaranteed value, can be read either '1' or ’0.’

2. DQ7-DQ0 represent the Data Bus bits, D7-D0.

3. FS0-FS7 and CSBOOT0-CSBOOT3 are active High.

DQ4

X

DQ3

Erase

Time-

out

DQ2

X

DQ1

X

DQ0

X

23/110

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