ST7FLITE02 STMICROELECTRONICS [STMicroelectronics], ST7FLITE02 Datasheet - Page 115

• Manufacturer Part Number: ST7FLITE02
• Description: 8-BIT MICROCONTROLLER WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

OPTION BYTES (Cont’d)
OPTION BYTE 1
Bit 7 = PLLx4x8 PLL Factor selection.
0: PLLx4
1: PLLx8
Bit 6 = PLLOFF PLL disabled
0: PLL enabled
1: PLL disabled (by-passed)
Bit 5 = Reserved, must always be 1.
Table 21. List of valid option combinations
Note: see Clock Management Block diagram in
Bits 3:2 = LVD[1:0] Low voltage detection selec-
tion
These option bits enable the LVD block with a se-
lected threshold as shown in
Table 22. LVD Threshold Configuration
Default
V
2.4V - 3.3V
3.3V - 5.5V
LVD Off
Highest Voltage Threshold (∼4.1V)
Medium Voltage Threshold (∼3.5V)
Lowest Voltage Threshold (∼2.8V)
Value
DD
range
7
1
Operating conditions
Configuration
Reserved
Clock Source
Internal RC 1%
External clock
Internal RC 1%
External clock
1
1
OPTION BYTE 0
1
Table
SEC1 SEC0
1
22.
LVD1 LVD0
1
1
1
0
0
PLL
off
x4
x8
off
x4
x8
off
x4
x8
off
x4
x8
FMP
R
0
1
0
1
0
Figure 13
FMP
W
0
0
Bit 4 = OSC RC Oscillator selection
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.
Bit 1 = WDG SW Hardware or software watchdog
This option bit selects the watchdog type.
0: Hardware (watchdog always enabled)
1: Software (watchdog to be enabled by software)
Bit 0 = WDG HALT Watchdog Reset on Halt
This option bit determines if a RESET is generated
when entering HALT mode while the Watchdog is
active.
0: No Reset generation when entering Halt mode
1: Reset generation when entering Halt mode
Typ f
0.7MHz @3V
2.8MHz @3V
-
0-4MHz
4MHz
-
1MHz @5V
-
8MHz @5V
0-8MHz
-
8 MHz
x4x8
PLL
7
1
CPU
OFF
PLL
1
1
OPTION BYTE 1
OSC
OSC LVD1 LVD0
0
0
1
1
0
0
1
1
-
-
-
-
0
ST7LITE0x, ST7LITESx
Option Bits
1
PLLOFF
DD
1
0
1
0
1
0
1
0
-
-
-
-
1
and V
WDG
SW
SS
1
PLLx4x8
pins as
115/125
1
0
1
0
1
1
1
1
HALT
-
-
-
-
WDG
0
1