ST7FL15F1MAE STMICROELECTRONICS [STMicroelectronics], ST7FL15F1MAE Datasheet - Page 127

• Manufacturer Part Number: ST7FL15F1MAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

OPTION BYTES (cont’d)
15.1.1 Flash Option Bytes
The 2 option bytes allow the hardware configura-
tion of the microcontroller to be selected.
OPTION BYTE 0
OPT7 = Reserved (must be set to 0)
OPT6 = Reserved (must be set to 1)
OPT5:4 = CLKSEL Clock Source Selection
When the internal RC oscillator is not selected
(Option OSC = 1), these option bits select the
clock source: Resonator oscillator or external
clock.
Note: When the internal RC oscillator is selected,
the CLKSEL option bits must be kept at their de-
fault value in order to select the 256 clock cycle
delay (see
OPT 3:2 = SEC[1:0] Sector 0 size definition
These option bits indicate the size of sector 0 ac-
cording to the following table.
OPT1 = FMP_R Readout protection
Readout protection, when selected provides a pro-
tection against program memory content extrac-
tion 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.
Sector 0 Size
Resonator
External clock
source: CLKIN
Reserved
0.5 Kbyte
2 Kbytes
4 Kbytes
1 Kbyte
Clock Source
Section
on PB4 Ext. Osc Disabled/
on PC0
7.5).
SEC1
0
1
Ext. Osc Enabled/
Port C Disabled
Port C Enabled
Port C
SEC0
0
1
0
1
CLKSEL
2
0
0
1
1
1
0
1
1
0
Refer to the ST7 Flash Programming Reference
Manual and
tails.
0: Readout protection off
1: Readout protection on
OPT 0 = FMP_W Flash write protection
This option indicates if the Flash program memory
is write protected.
Warning: When this option is selected, the pro-
gram memory (and the option bit itself) can never
be erased or programmed again.
0: Write protection off
1: Write protection on
OPTION BYTE 1
OPT7 = PLLx4x8 PLL Factor selection
0: PLLx4
1: PLLx8
OPT 6 = PLLOFF PLL Disable
This option bit enables or disables the PLL.
0: PLL enabled
1: PLL disabled (bypassed)
OPT 5 = Reserved (must be set to 1)
OPT 4 = OSC RC Oscillator Selection
This option bit enables to select the internal RC
oscillator.
0: RC oscillator on
1: RC oscillator off
Note: If the RC oscillator is selected, then to im-
prove clock stability and frequency accuracy, it is
recommended to place a decoupling capacitor,
typically 100nF, between the V
close as possible to the ST7 device.
OPT 3:2 = LVD[1:0] Low Voltage Selection
These option bits enable the voltage detection
block (LVD) with a selected threshold to the LVD.
LVD Off
LVD High Threshold
Configuration
section 4.5 on page 12
ST7L15, ST7L19
DD
VD1
1
and V
for more de-
SS
VD0
pins as
127/138
1
0