ST10F271Z1T3 datasheet(26/185 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F271Z1

26/185

The table above refers to the configuration when bit ROMS1 of SYSCON register is set.

When Bootstrap mode is entered:

●

Test-Flash is seen and available for code fetches (address 00’0000h)

●

User I-Flash is only available for read and write accesses

●

Write accesses must be made with addresses starting in segment 1 from 01'0000h,

whatever ROMS1 bit in SYSCON value

●

Read accesses are made in segment 0 or in segment 1 depending of ROMS1 value.

In Bootstrap mode, by default ROMS1 = 0, so the first 32 Kbytes of IFlash are mapped in

segment 0.

Example:

In default configuration, to program address 0, user must put the value 01'0000h in the

FARL and FARH registers, but to verify the content of the address 0 a read to 00'0000h must

be performed.

Next Table 6: Control register interface shows the Control Register interface composition:

this set of registers can be addressed by the CPU.

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.

Table 6.

Control register interface

Name

Description

Addresses

Size

Bus

size

FCR1-0

Flash control registers 1-0

0x0008 0000 - 0x0008 0007

8 byte

16-bit

FDR1-0

Flash data registers 1-0

0x0008 0008 - 0x0008 000F

8 byte

FAR

Flash address registers

0x0008 0010 - 0x0008 0013

4 byte

FER

Flash error register

0x0008 0014 - 0x0008 0015

2 byte

FNVWPIR

Flash non volatile protection I Register

0x0008 DFB0 - 0x0008

DFB1

2 byte

FNVAPR0

Flash non-volatile access protection

0x0008 DFB8 - 0x0008

DFB9

2 byte

FNVAPR1

Flash non-volatile access protection

0x0008 DFBC - 0x0008

DFBF

4 byte

XFVTAUR0

XBus Flash volatile temporary access

unprotection register 0

0x0000 EB50 - 0x0000 EB51 2 byte

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