ST7LITE49M datasheet(176/188 Pages) STMICROELECTRONICS

176 / 188 page

Device configuration and ordering information

ST7LITE49M

176/188

14.1.2

Option byte 0

●

OPT7 = AWUCK Auto Wake Up Clock Selection

0: 32-kHz Oscillator (VLP) selected as AWU clock

1: AWU RC Oscillator selected as AWU clock.

Note:

If this bit is reset, OSCRANGE[2:0] must be set to 100.

●

OPT6:4 = OSCRANGE[2:0] Oscillator Range

When the internal RC oscillator is not selected (CKSEL1=1), these option bits (and

CKSEL0) select the range of the resonator oscillator current source or the external

clock source.

●

OPT 3:2 = SEC[1:0] Sector 0 size definition

These option bits indicate the size of sector 0 according to Table 99.

●

Bit 1 = FMP_R Read-Out Protection

Read-Out Protection, when selected provides a protection against program memory

content extraction and against write access to Flash memory. Erasing the option bytes

when the FMP_R option is selected will cause the whole memory to be erased first,

and the device can be reprogrammed. Refer to Section 4.5 on page 24 and the ST7

Flash Programming Reference Manual for more details.

0: Read-Out Protection off

1: Read-Out Protection on

Table 98.

Selection of the resonator oscillator range

OSCRANGE(1)

When the internal RC oscillator is selected, the CLKSEL option bits must be kept at their default value in

order to select the 256 clock cycle delay (see Section 7.3).

Typ. frequency range

with Resonator

1~2MHz

2~4MHz

4~8MHz

8~16MHz

VLP

32.768kHz

External Clock on OSC1/CLKIN

Reserved

External Clock on PB1

Table 99.

Configuration of sector size

Sector 0 Size

SEC1

SEC0

0.5k

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