ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 33

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 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
• 128 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
• A/d Converter: 10 input channels

ST7LITE49M
7
7.1
7.1.1
Supply, reset and clock management
The device includes a range of utility features for securing the application in critical
situations (for example in case of a power brown-out), and reducing the number of external
components. The main features are the following:
●
●
●
RC oscillator adjustment
Internal RC oscillator
The device contains an internal RC oscillator with a specific accuracy for a given device,
temperature and voltage range (4.5 V - 5.5 V). It must be calibrated to obtain the frequency
required in the application. This is done by software writing a 10-bit calibration value in the
RCCR (RC control register) and in the bits 6:5 in the SICSR (SI control status register).
Whenever the microcontroller is reset, the RCCR returns to its default value (FFh), i.e. each
time the device is reset, the calibration value must be loaded in the RCCR. Predefined
calibration values are stored in EEPROM for 3 and 5 V V
Table
Table 5.
1. The DEE0h, DEE1h, DEE2h and DEE3h addresses are located in a reserved area in non-volatile memory.
They are read-only bytes for the application code. This area cannot be erased or programmed by any ICC
operations.
For compatibility reasons with the SICSR register, CR[1:0] bits are stored in the 5th and 6th position of
DEE1 and DEE3 addresses.
RCCRH0
RCCRH1
RCCRL0
RCCRL1
Clock management
–
–
–
–
Reset sequence manager (RSM)
System integrity management (SI)
–
–
5).
RCCR
8 MHz internal RC oscillator (enabled by option byte)
Auto-wakeup RC oscillator (enabled by option byte)
1 to 16 MHz or 32 kHz External crystal/ceramic resonator (selected by option byte)
External clock input (enabled by option byte)
Main supply low voltage detection (LVD) with reset generation (enabled by option
byte)
Auxiliary voltage detector (AVD) with interrupt capability for monitoring the main
supply (enabled by option byte)
Predefined RC oscillator calibration values
f
f
V
Conditions
RC
RC
T
T
V
DD
A
A
DD
= 8 MHz
= 25°C
= 8 MHz
= 25°C
Doc ID 13562 Rev 3
= 3.3 V
= 5V
Supply, reset and clock management
DD
supply voltages at 25 °C (see
DEE0h
DEE1h
DEE2h
DEE3h
ST7LITE49M
Address
(1)
(1)
(1)
(1)
(CR[9:2])
(CR[1:0])
(CR[9:2])
(CR[1:0])
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