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| 型号： | M52259EVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 37/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR 52259 COLDFIRE V2 |
| 产品培训模块： | ColdFire MCF5225x |
| 标准包装： | 1 |
| 系列： | ColdFire® |
| 类型： | MCU |
| 适用于相关产品： | MCF52259 |
| 所含物品： | 板，线缆，文档，DVD，闪光灯驱动和电源 |
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Electrical Characteristics
2.14
I2C Input/Output Timing Specifications
Table 23. I2C Input Timing Specifications between I2C_SCL and I2C_SDA
Num
I1
I2
I3
I4
I5
I6
I7
I8
I9
Characteristic
Start condition hold time
Clock low period
SCL/SDA rise time (V IL = 0.5 V to V IH = 2.4 V)
Data hold time
SCL/SDA fall time (V IH = 2.4 V to V IL = 0.5 V)
Clock high time
Data setup time
Start condition setup time (for repeated start condition only)
Stop condition setup time
Min
2 ? t CYC
8 ? t CYC
—
0
—
4 ? t CYC
0
2 ? t CYC
2 ? t CYC
Max
—
—
1
—
1
—
—
—
—
Units
ns
ns
ms
ns
ms
ns
ns
ns
ns
Table 24. I2C Output Timing Specifications between I2C_SCL and I2C_SDA
Num
I1 1
I2 1
I3 2
Characteristic
Start condition hold time
Clock low period
I2C_SCL/I2C_SDA rise time
Min
6 ? t CYC
10 ? t CYC
—
Max
—
—
—
Units
ns
ns
? s
(V IL = 0.5 V to V IH = 2.4 V)
I4 1
Data hold time
7 ? t CYC
—
ns
I5
3
I2C_SCL/I2C_SDA fall time
—
3
ns
(V IH = 2.4 V to V IL = 0.5 V)
I6 1
Clock high time
10 ? t CYC
—
ns
I7
Data setup time
2 ? t CYC
—
ns
I8 1
Start condition setup time (for repeated start
20 ? t CYC
—
ns
condition only)
I9 1
Stop condition setup time
10 ? t CYC
—
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 24 . 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 24 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.
MCF52259 ColdFire Microcontroller, Rev. 5
37
Freescale
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相关代理商/技术参数 |
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| M52259EVB | 制造商:Freescale Semiconductor 功能描述:MCF5225x Evaluation Board |
| M5226P | 制造商:Panasonic Industrial Company 功能描述:IC |
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