参数资料
型号: ST7263BK1B/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, LEAD FREE, SHRINK, PLASTIC, DIP-32
文件页数: 26/140页
文件大小: 1423K
代理商: ST7263BK1B/XXX
ST7263B
121/140
COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d)
Figure 72. Typical Application with I2C Bus and Timing Diagram 1)
Note:
1. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD.
The following table gives the values to be written in
the I2CCCR register to obtain the required I2C
SCL line frequency .
Table 28. SCL Frequency Table
Legend:
RP = External pull-up resistance
fSCL = I
2C speed
NA = Not achievable
Notes:
– 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.
REPEATED START
START
STOP
START
tf(SDA)
tr(SDA)
tsu(SDA)
th(SDA)
tf(SCK)
tr(SCK)
tw(SCKL)
tw(SCKH)
th(STA)
tsu(STO)
tsu(STA)
tw(STO:STA)
SDA
SCK
4.7k
SDAI
ST72XXX
SCLI
VDD
100
100
VDD
4.7k
I2CBUS
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=3.3k
RP=4.7k
RP=3.3k
RP=4.7k
RP=3.3k
RP=4.7k
RP=3.3k
RP=4.7k
400
NA
83h
83
83h
300
NA
85h
200
83h
8Ah
89h
8Ah
100
10h
24h
23h
24h
23h
50
24h
4Ch
20
5Fh
FFh
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