RM0352 datasheet(35/138 Pages) STMICROELECTRONICS

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RM0352

Embedded Flash memory

137

The APB actions that need to be performed are:

•

Write ADDRESS register value of the word you want to write.

•

Write DATA register with the value you want to program.

•

Write PROGRAM command value to the COMMAND register.

MASS WRITE

One word can be programmed to every location in program memory.

The APB actions that need to be performed are:

•

Write DATA register with the value you want to program.

•

Write MASS WRITE command value to the COMMAND register.

MASS READ

Every location in program memory can be read with one command.

The APB actions that need to be performed are:

•

Write DATA with the value you want to compare with (if READOK flag needs to be

checked). There is no need to write the DATA register to read the signature in the

LFSRVAL register).

•

Write MASS READ command value to the COMMAND register.

READOK can be checked to see if all locations matched the DATA register value

(READOK = '1'), or if one or more locations mismatched (READOK = '0').

Every mass read will generate a readable signature (register LFSRVAL).

6.3.5

CONFIG register

The Flash can be read in one system clock cycle (the best for power consumption) when the

system clock is 16 MHz maximum, at lower frequencies the Flash is still functional. For

higher frequency,

Table 22 shall be taken into account:

Table 21. Flash CONFIG register

Bit

Name

Description

0REGISTERED

0 = read access of 1 system clock.

1 = read access of 2 system clock with registered value.

REMAP

Remap bit for top-level use.

RESERVED

RESERVED - Do not modify

5:4

WAIT[1:0]

Wait states for high clock speed above 16 MHz

RESERVED

RESERVED - Do not modify

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