參數(shù)資料
型號(hào): MCF52221
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Microcontroller Data Sheet
中文描述: 微控制器數(shù)據(jù)表
文件頁(yè)數(shù): 36/56頁(yè)
文件大?。?/td> 811K
代理商: MCF52221
MCF52223 ColdFire Microcontroller Data Sheet, Rev. 1
Preliminary
Preliminary Electrical Characteristics
2.10 I
2
C Input/Output Timing Specifications
Table 28
lists specifications for the I
2
C input timing parameters shown in
Figure 7
.
Table 28. I
2
C Input Timing Specifications between I2C_SCL and I2C_SDA
Freescale Semiconductor
36
Table 29
lists specifications for the I
2
C output timing parameters shown in
Figure 7
.
Table 29. I
2
C Output Timing Specifications between I2C_SCL and I2C_SDA
Figure 7
shows timing for the values in
Table 28
and
Table 29
.
Num
Characteristic
Min
Max
Units
11
Start condition hold time
2 x t
CYC
ns
I2
Clock low period
8 x t
CYC
ns
I3
SCL/SDA rise time (V
IL
= 0.5 V to V
IH
= 2.4 V)
1
mS
I4
Data hold time
0
ns
I5
SCL/SDA fall time (V
IH
= 2.4 V to V
IL
= 0.5 V)
1
mS
I6
Clock high time
4 x t
CYC
ns
I7
Data setup time
0
ns
I8
Start condition setup time (for repeated start condition only)
2 x t
CYC
ns
I9
Stop condition setup time
2 x t
CYC
ns
Num
Characteristic
Min
Max
Units
11
1
NOTES:
1
Note: Output numbers depend on the value programmed into the IFDR; an IFDR programmed with
the maximum frequency (IFDR = 0x20) results in minimum output timings as shown in
Table 29
. The
I
2
C interface is designed to scale the actual data transition time to move it to the middle of the SCL
low period. The actual position is affected by the prescale and division values programmed into the
IFDR; however, the numbers given in
Table 29
are minimum values.
2
Because SCL and SDA are open-collector-type outputs, which the processor can only actively drive
low, the time SCL or SDA take to reach a high level depends on external signal capacitance and
pull-up resistor values.
3
Specified at a nominal 50-pF load.
Start condition hold time
6 x t
CYC
ns
I2
1
Clock low period
10 x t
CYC
ns
I3
2
I2C_SCL/I2C_SDA rise time
(V
IL
= 0.5 V to V
IH
= 2.4 V)
μS
I4
1
Data hold time
7 x t
CYC
ns
I5
3
I2C_SCL/I2C_SDA fall time
(V
IH
= 2.4 V to V
IL
= 0.5 V)
3
ns
I6
1
Clock high time
10 x t
CYC
ns
I7
1
Data setup time
2 x t
CYC
ns
I8
1
Start condition setup time (for repeated start
condition only)
20 x t
CYC
ns
I9
1
Stop condition setup time
10 x t
CYC
ns
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