ST72F344K4T6 STMicroelectronics, ST72F344K4T6 Datasheet - Page 45

• Manufacturer Part Number: ST72F344K4T6
• Description: MCU 8BIT 16KB FLASH MEM 32-LQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F344K4T6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: ST72F3x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: I2C, SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST72F34X-SK/RAIS, ST7MDT40-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• For Use With: 497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5611

ST72344xx ST72345xx
7.3.3
Note:
Caution:
7.4
7.4.1
Internal RC oscillator
The device contains a high-precision internal RC oscillator. It must be calibrated to obtain
the frequency required in the application. This is done by software writing a calibration value
in the RCCRH and RCCRL Registers.
Whenever the microcontroller is reset, the RCCR returns to its default value (FF 03h), i.e.
each time the device is reset, the calibration value must be loaded in the RCCRH and
RCCRL registers. Predefined calibration values are stored in XFlash for 3 and 5V V
supply voltages at 25 °C, as shown in the following table:
Table 9.
To improve clock stability, it is recommended to place a decoupling capacitor between the
V
These two 10-bit values are systematically programmed by ST.
RCCR0 and RCCR1 calibration values will be erased if the read-out protection bit is reset
after it has been set. See
If the voltage or temperature conditions change in the application, the frequency may need
to be recalibrated.
Refer to application note AN1324 for information on how to calibrate the RC frequency using
an external reference signal.
Register description
RC control register (RCCRH)
Reset value: 1111 1111 (FFh)
Bits 7:0 = CR[9:2] RC oscillator frequency adjustment bits
DD
CR9
and V
7
RCCR0
RCCR1
RCCR
SS
Calibration values
pins.
CR8
Memory protection on page
CR7
Doc ID 12321 Rev 5
f
f
Conditions
RC
RC
T
T
V
V
A
A
DD
DD
= 25 °C
= 1 MHz
= 25 °C
= 1 MHz
= 5 V
= 3 V
CR6
Read/Write
CR5
Supply, reset and clock management
29.
CR4
BEE0, BEE1
BEE4, BEE5
Address
CR3
DD
CR2
0
45/247