参数资料
型号: MCF52231CAL60
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP112
封装: 20 X 20 MM. 1.40 MM HEIGHT, 0.65 MM PITCH, ROHS COMPLIANT, MS-026BFA, LQFP-112
文件页数: 31/55页
文件大小: 636K
代理商: MCF52231CAL60
Electrical Characteristics
MCF52235 ColdFire Microcontroller Data Sheet, Rev. 10
Freescale Semiconductor
37
Figure 8 shows timing for the values in Table 28 and Table 29.
Figure 8. I2C Input/Output Timings
Table 29. I2C Output Timing Specifications between I2C_SCL and I2C_SDA
Num
Characteristic
Min
Max
Units
I1 1
Start condition hold time
6
t
CYC
—ns
I2 1
Clock low period
10
t
CYC
—ns
I3 2
I2C_SCL/I2C_SDA rise time
(VIL = 0.5 V to VIH = 2.4 V)
——
s
I4 1
Data hold time
7
t
CYC
—ns
I5 3
I2C_SCL/I2C_SDA fall time
(VIH = 2.4 V to VIL = 0.5 V)
—3
ns
I6 1
Clock high time
10
t
CYC
—ns
I7 1
Data setup time
2
t
CYC
—ns
I8 1
Start condition setup time (for repeated start
condition only)
20 x tCYC
—ns
I9 1
Stop condition setup time
10 x tCYC
—ns
1 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 I2C
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.
I2
I6
I1
I4
I7
I8
I9
I5
I3
SCL
SDA
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