ST7SCR datasheet(92/101 Pages) STMICROELECTRONICS

92 / 101 page

ST7SCR

92/101

16 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in user pro-

grammable versions (High Density FLASH) as

well as in factory coded versions (ROM/FAS-

TROM).

ST7SCR devices are ROM versions. ST7PSCR

devices are Factory Advanced Service Technique

ROM (FASTROM) versions: they are factory pro-

grammed FLASH devices.

ST7FSCR FLASH devices are shipped to custom-

ers with a default content (FFh).

This implies that FLASH devices have to be con-

figured by the customer using the Option Byte

while the ROM devices are factory-configured.

16.0.1 Option Bytes

The 8 option bits from the flash are programmed

through the static option byte SOB1. The descrip-

tion of each of these 8 bits is given below.

Static option Byte (SOB1)

OPT7:6 = Reserved

OPT5= WDGSW Hardware or software watchdog

This option bit selects the watchdog type.

0: Hardware (watchdog always activated)

1: Software (watchdog to be activated by software)

OPT4 = NEST Interrupt Controller

This bit enables the nested Interrupt Controller.

0: Nested interrupt controller disabled

1: Nested interrupt controller enabled

OPT3 = ISOCLK Clock source selection

0: Card clock is generated by the divider (48MHz/

12 = 4MHz).

1: Card clock is generated by the oscillator.

OPT2 = RETRY Number of Retries for UART ISO

0: In case of an erroneous transfer, character is

transmitted 4 times.

1: In case of an erroneous transfer, character is

transmitted 5 times.

OPT1 = Reserved, must be kept at 1.

OPT0 = FMP_R Flash memory read-out protec-

tion

Readout protection, when selected provides a pro-

tection against program memory content extrac-

tion and against write access to Flash memory.

This protection is based on read and a write pro-

tection of the memory in test modes and ICP

mode. Erasing the option bytes when the FMP_R

option is selected induce the whole user memory

erasing first and the device can be reprogrammed.

Refer to the ST7 Flash Programming Reference

Manual and section 4.6 on page 17 for more de-

tails

0 : read-out protection enabled

1 : read-out protection disabled

OPT

765

432

OPT

WDG-

NEST ISOCLK RETRY

FMP_R

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