ST7LITE49K2 STMicroelectronics, ST7LITE49K2 Datasheet - Page 230

• Manufacturer Part Number: ST7LITE49K2
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49K2

• 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10K write/erase cycles guaranteed Data retention
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow

Device configuration and ordering information
14
14.1
14.1.1
230/245
Device configuration and ordering information
This device is available for production in user programmable version (Flash).
ST7LITE49K2 XFlash devices are shipped to customers with a default program memory
content (FFh).
Option bytes
The two option bytes allow the hardware configuration of the microcontroller to be selected.
The option bytes can be accessed only in programming mode (for example using a standard
ST7 programming tool).
Option byte 1
Bits 7:6 = CKSEL[1:0] Start-up clock selection.
Table 106. Startup clock selection
Bit 5 = Reserved, must always be 1.
Bit 4 = PLL32OFF 32 MHz PLL disabled.
Bits 3:2 = LVD[1:0] Low voltage detection selection.
Table 107. LVD threshold configuration
These bits are used to select the startup frequency. By default, the internal RC is
selected.
0: PLL32 enabled
1: PLL32 disabled (by-passed). By default the PLL32 is disabled.
These option bits enable the low voltage detection block (LVD) with a selected
threshold as shown in
External crystal/ceramic resonator
Internal RC as startup clock
AWU RC as a startup clock
Configuration
External clock
Medium voltage threshold
Highest voltage threshold
Lowest voltage threshold
LVD Off (default value)
Table
Configuration
107.
CKSEL1
0
0
1
1
VD1
1
1
0
0
ST7LITE49K2
CKSEL0
0
1
0
1
VD0
1
0
1
0