參數(shù)資料
型號(hào): MPC8541EVTAKEX
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA360
封裝: 25 X 25 MM, 2.40 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, HCTE, CERAMIC, BGA-360
文件頁(yè)數(shù): 40/84頁(yè)
文件大?。?/td> 1241K
代理商: MPC8541EVTAKEX
MPC8541E PowerQUICC III Integrated Communications Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
45
CPM
10.3
CPM I2C AC Specification
Figure 29. CPM I2C Bus Timing Diagram
The following two tables are examples of I2C AC parameters at I2C clock value of 100k and 400k
respectively.
Table 35. I2C Timing
Characteristic
Expression
All Frequencies
Unit
Min
Max
SCL clock frequency (slave)
fSCL
0FMAX
(1)
Notes:
1.
FMAX = BRGCLK/(min_divider*prescale. Where prescaler=25-I2MODE[PDIV]; and min_divider=12 if digital filter disabled
and 18 if enabled.
Example #1: if I2MODE[PDIV]=11 (prescaler=4) and I2MODE[FLT]=0 (digital filter disabled) then FMAX=BRGCLK/48
Example #2: if I2MODE[PDIV]=00 (prescaler=32) and I2MODE[FLT]=1 (digital filter enabled) then FMAX=BRGCLK/576
Hz
SCL clock frequency (master)
fSCL
BRGCLK/16512
BRGCLK/48
Hz
Bus free time between transmissions
tSDHDL
1/(2.2 * fSCL)-
s
Low period of SCL
tSCLCH
1/(2.2 * fSCL)-
s
High period of SCL
tSCHCL
1/(2.2 * fSCL)-
s
Start condition setup time2
tSCHDL
2/(divider * fSCL)
- (2)
2. divider = fSCL/prescaler.
In master mode: divider=BRGCLK/(fSCL*prescaler)=2*(I2BRG[DIV]+3)
In slave mode: divider=BRGCLK/(fSCL*prescaler)
s
Start condition hold time2
tSDLCL
3/(divider * fSCL)-
s
Data hold time 2
tSCLDX
2/(divider * fSCL)-
s
Data setup time2
tSDVCH
3/(divider * fSCL)-
s
SDA/SCL rise time
tSRISE
-
1/(10 * fSCL)s
SDA/SCL fall time
tSFALL
-
1/(33 * fSCL)s
Stop condition setup time
tSCHDH
2/(divider * fSCL)
-
s
Table 36. CPM I2C Timing (fSCL=100KHz)
Characteristic
Expression
Frequency = 100KHz
Unit
Min
Max
SCL clock frequency (slave)
fSCL
100
KHz
SCL clock frequency (master)
fSCL
-
100
KHz
Bus free time between transmissions
tSDHDL
4.7
-
μs
Low period of SCL
tSCLCH
4.7
-
μs
SCL
SDA
tSDHDL
tSCLCH
tSCHCL
tSCHDL
tSDLCL
tSCLDX
tSDVCH
tSRISE
tSFALL
tSCHDH
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