PSD4235G2V-10UI datasheet(29/100 Pages) STMICROELECTRONICS

tên linh kiện	PSD4235G2V-10UI

Giải thích chi tiết về linh kiện	Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs

PDF	100 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

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PSD4256G6V

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

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 30.

The status byte resides in an even location, and

can be read as many times as needed. Also note

that DQ15-DQ8 is an even byte for Motorola

MCUs with a 16-bit data bus.

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”, on page

31, for details.

Table 30. Status Bits

Table 31. Status Bits for Motorola 16-bit MCU

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

DQ15-DQ0 represent the Data Bus bits, D15-D0.

FS0-FS15/CSBOOT0-CSBOOT3 are active High.

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

Data Polling

Toggle Flag

Error Flag

Erase Time-

out

XXX

DQ15

DQ14

DQ13

DQ12

DQ11

DQ10

DQ9

DQ8

Data Polling

Toggle Flag

Error Flag

Erase Time-

out

XXX

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