ST7263BEx datasheet(25/186 Pages) STMICROELECTRONICS

25 / 186 page

ST7263Bxx

Flash program memory

Doc ID 7516 Rev 8

25/186

4.3.1

Readout protection

Readout protection, when selected, provides a protection against program memory content

extraction and against write access to Flash memory. Even if no protection can be

considered as totally unbreakable, the feature provides a very high level of protection for a

general purpose microcontroller.

In Flash devices, this protection is removed by reprogramming the option. In this case, the

entire program memory is first automatically erased and the device can be reprogrammed.

Readout protection selection depends on the device type:

●

In Flash devices it is enabled and removed through the FMP_R bit in the option byte.

●

In ROM devices it is enabled by mask option specified in the Option List.

Figure 8.

Memory map and sector address

4.4

ICC interface

ICC (In-circuit communication) needs a minimum of four and up to six pins to be connected

to the programming tool (see Figure 9). These pins are:

●

RESET: device reset

●

VSS: device power supply ground

●

ICCCLK: ICC output serial clock pin

●

ICCDATA: ICC input/output serial data pin

●

ICCSEL/VPP: programming voltage

●

OSC1(or OSCIN): main clock input for external source (optional)

●

VDD: application board power supply (see Figure 9, Note 3)

4 Kbytes

2Kbytes

SECTOR 1

SECTOR 0

16 Kbytes

SECTOR 2

16K

32K

60K

FLASH

FFFFh

EFFFh

DFFFh

3FFFh

7FFFh

1000h

24 Kbytes

MEMORY SIZE

8Kbytes

40 Kbytes 52 Kbytes

9FFFh

BFFFh

D7FFh

10K

24K

48K

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