ST7DALIF2 STMicroelectronics, ST7DALIF2 Datasheet - Page 35

• Manufacturer Part Number: ST7DALIF2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7DALIF2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

ST7DALIF2
9.4.2
Note:
RC control register (RCCR)
Read / Write
Reset Value: 1111 1111 (FFh)
Bits 7:0 = CR[7:0] RC Oscillator Frequency Adjustment Bits
These bits must be written immediately after reset to adjust the RC oscillator frequency and
to obtain an accuracy of 1%. The application can store the correct value for each voltage
range in EEPROM and write it to this register at start-up.
00h = maximum available frequency
FFh = lowest available frequency
To tune the oscillator, write a series of different values in the register until the correct
frequency is reached. The fastest method is to use a dichotomy starting with 80h.
Figure 12. Clock management block diagram
CLKIN
CLKIN
/OSC1
OSC2
CR70
7
1-16 MHZ
or 32kHz
f
OSC2
CR7
OSC
OSCRANGE[2:0]
CR60
CLKIN
OSC,PLLOFF,
CLKIN
CR6
/32 DIVIDER
Option bits
CR5
1% RC
Tunable
CR4
CR50
Oscillator
CR3
f
OSC
DIVIDER
CR2
LITE TIMER 2 COUNTER
/2
f
f
OSC2
OSC2
CR40
MCO
DIVIDER
CR1
/2
/32
8-BIT
SMS
f
1
CPU
0
CR0
MCCSR
PLL 1MHz -> 8MHz
PLL 1MHz -> 4MHz
CLKIN/2
CR30
RCCR
Supply, reset and clock management
8MHz -> 32MHz
PLL
(1ms timebase @ 8 MHz f
CR20
f
LTIMER
RC OSC
PLLx4x8
CLKIN/2
OSC/2
f
CPU
OSCRANGE[2:0]
OSC,PLLOFF,
Option bits
AT TIMER 2
TO CPU AND
PERIPHERALS
CR10
12-BIT
f
CPU
f
OSC2
OSC2
)
CR
0
35/171
MCO
0