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ST72321 Datasheet(PDF) 166 Page - STMicroelectronics

No. de pieza ST72321
Descripción Electrónicos  64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC,FIVE TIMERS, SPI, SCI, I2C INTERFACE
PDF  189 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321 Datasheet(HTML) 166 Page - STMicroelectronics

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COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d)
The following table gives the values to be written in
the I2CCCR register to obtain the required I2C
SCL line frequency.
Table 27. SCL Frequency Table
Legend:
RP = External pull-up resistance
fSCL = I
2C speed
NA = Not achievable
Note:
– For speeds around 200 kHz, achieved speed can have
±5% tolerance
– For other speed ranges, achieved speed can have
±2% tolerance
The above variations depend on the accuracy of the external components used.
fSCL
(kHz)
I2CCCR Value
fCPU=4 MHz.
fCPU=8 MHz.
VDD = 4.1 V
VDD = 5 V
VDD = 4.1 V
VDD = 5 V
RP=3.3kΩ
RP=4.7kΩ
RP=3.3kΩ
RP=4.7kΩ
RP=3.3kΩ
RP=4.7kΩ
RP=3.3kΩ
RP=4.7kΩ
400
NA
NA
NA
NA
83h
83
83h
83h
300
NA
NA
NA
NA
85h
85h
85h
85h
200
83h
83h
83h
83h
8Ah
89h
8Ah
8Ah
100
10h
10h
10h
10h
24h
23h
24h
23h
50
24h
24h
24h
24h
4Ch
4Ch
4Ch
4Ch
20
5Fh
5Fh
5Fh
5Fh
FFh
FFh
FFh
FFh



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