ST10F273E datasheet(28/179 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F273E

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5.2.3

Low power mode

The Flash module is automatically switched off executing PWRDN instruction. The

consumption is drastically reduced, but exiting this state can require a long time (tPD).

Recovery time from Power down mode for the Flash modules is anyway shorter than the

main oscillator start-up time. To avoid any problem in restarting to fetch code from the Flash,

it is important to size properly the external circuit on RPD pin.

Note:

PWRDN instruction must not be executed while a Flash program/erase operation is in

progress.

5.3

Write operation

The Flash module have one single register interface mapped in the memory space 0x0E

0000 to 0x0E 0015. All the operations are enabled through four 16-bit control registers:

Flash Control Register 1-0 High/Low (FCR1H/L-FCR0H/L). Eight other 16-bit registers are

used to store Flash Address and Data for Program operations (FARH/L and FDR1H/L-

FDR0H/L) and Write Operation Error flags (FERH/L). All registers are accessible with 8 and

16-bit instructions (since operates in 16-bit mode when in read/ write).

Before accessing the Flash registers used for program/erasing operations, bit 5

(XFLASHEN) in XPERCON register shall be set.

The two banks have their own dedicated sense amplifiers, so that one bank can be read

while the other is written.

During a Flash write operation, any attempt to read the bank under modification will output

invalid data (software trap 009Bh). This means that the Flash bank is not fetchable when a

programming operation is active: The write operation commands must be executed from

another bank or from the other memory (internal RAM or external memory).

During a Write operation, when bit LOCK of FCR0 is set, it is forbidden to write into the

Flash Control Registers.

Table 6.

Control register interface

Name

Description

Addresses

Size

Bus

size

FCR1-0

Flash control registers 1-0

0x000E 0000 - 0x000E 0007

8 byte

16-bit

(XBUS)

FDR1-0

Flash data registers 1-0

0x000E 0008 - 0x000E 000F

8 byte

FAR

Flash address registers

0x000E 0010 - 0x000E 0013

4 byte

FER

Flash error register

0x000E 0014 - 0x000E 0015

2 byte

FNVWPIR

Flash non volatile protection I

0x000E DFB4 - 0x000E DFB7

4 byte

FNVAPR0

Flash Non volatile access

protection register 0

0x000E DFB8 - 0x000E DFB9

2 byte

FNVAPR1

Flash non volatile access

protection register 1

0x000E DFBC - 0x000E DFBF

4 byte

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