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ST10F272B Datasheet(PDF) 29 Page - STMicroelectronics

Part # ST10F272B
Description  16-bit MCU with 256 Kbyte Flash memory and 12/20 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F272B Datasheet(HTML) 29 Page - STMicroelectronics

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ST10F272B/ST10F272E
Internal Flash memory
29/181
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 32KBytes 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 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
Register 0
0x0008 DFB8 - 0x0008
DFB9
2 byte
FNVAPR1
Flash Non Volatile Access Protection
Register 1
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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