ST10F271B datasheet(126/180 Pages) STMICROELECTRONICS

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ST10F271B/ST10F271E

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IDPROG (F078h / 3Ch)

ESFR

Reset Value: 0040h

Note:

All identification words are read only registers.

The values written inside different Identification Register bits are valid only after the Flash

initialization phase is completed. When code execution is started from internal memory (pin

EA held high during reset), the Flash has certainly completed its initialization, so the bits of

Identification Registers are immediately ready to be read out. On the contrary, when code

execution is started from external memory (pin EA held low during reset), the Flash

initialization is not yet completed, so the bits of Identification Registers are not ready. The

user can poll bits 15 and 14 of IDMEM register: when both bits are read low, the Flash

initialization is complete, so all Identification Register bits are correct.

Before Flash initialization completion, the default setting of the different Identification

Registers are the following:

●

IDMANUF

0403h

●

IDCHIP

110xh (x = silicon revision)

●

IDMEM

F040h

●

IDPROG

0040h

765

210

PROGVPP

PROGVDD

Table 58.

IDPROG

Bit

Function

PROGVDD

Programming VDD voltage

VDD voltage when programming EPROM or FLASH devices is calculated using the

following formula: VDD = 20 x [PROGVDD] / 256 (volts) - 40h for ST10F271 (5V).

PROGVPP

Programming VPP voltage (no need of external VPP) - 00h

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