MPC855 datasheet(64/76 Pages) MOTOROLA

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MPC860 Family Hardware Speciﬁcations

MOTOROLA

I2C AC Electrical Specifications

11.11 I2C AC Electrical Speciﬁcations

Table 11-24 provides the I2C (SCL < 100 kHz) timings.

Table 11-25 provides the I2C (SCL > 100 kHz) timings.

Table 11-24. I2C Timing (SCL < 100 kHZ)

Num

Characteristic

All Frequencies

Unit

Min

Max

200

SCL clock frequency (slave)

100

kHz

200

SCL clock frequency (master) 1

1 SCL frequency is given by SCL = BRGCLK_frequency / ((BRG register + 3 × pre_scaler × 2).

The ratio SYNCCLK/(BRGCLK / pre_scaler) must be greater or equal to 4/1.

1.5

100

kHz

202

Bus free time between transmissions

4.7

—

µs

203

Low period of SCL

4.7

—

µs

204

High period of SCL

4.0

—

µs

205

Start condition setup time

4.7

—

µs

206

Start condition hold time

4.0

—

µs

207

Data hold time

—

µs

208

Data setup time

250

—

209

SDL/SCL rise time

—

µs

210

SDL/SCL fall time

—

300

211

Stop condition setup time

4.7

—

µs

Table 11-25. . I2C Timing (SCL > 100 kHZ)

Num

Characteristic

Expression

All Frequencies

Unit

Min

Max

200

SCL clock frequency (slave)

fSCL

BRGCLK/48

200

SCL clock frequency (master) 1

fSCL

BRGCLK/16512

BRGCLK/48

202

Bus free time between transmissions

1/(2.2 * fSCL)

—

203

Low period of SCL

1/(2.2 * fSCL)

—

204

High period of SCL

1/(2.2 * fSCL)

—

205

Start condition setup time

1/(2.2 * fSCL)

—

206

Start condition hold time

1/(2.2 * fSCL)

—

207

Data hold time

—

208

Data setup time

1/(40 * fSCL)

—

209

SDL/SCL rise time

—

1/(10 * fSCL)

210

SDL/SCL fall time

—

1/(33 * fSCL)

211

Stop condition setup time

1/2(2.2 * fSCL)

—

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