MPC8271VR datasheet(20/61 Pages) FREESCALE

20 / 61 page

MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3

Freescale Semiconductor

AC Electrical Characteristics

This figure shows the FCC external clock.

Figure 4. FCC External Clock Diagram

This figure shows the SCC/SMC/SPI/I2C external clock.

Figure 5. SCC/SMC/SPI/I2C External Clock Diagram

Serial ClKin

FCC input signals

FCC output signals

Note: When GFMR[TCI] = 1

Note: When GFMR[TCI] = 0

sp16b

sp17b

sp36b/sp37b

Serial CLKin

SCC/SMC/SPI/I2C input signals

SCC/SMC/SPI/I2C output signals

sp18b

sp19b

sp38b/sp39b

(See note)

Note: There are four possible timing conditions for SPI:

1. Input sampled on the rising edge and output driven on the rising edge.

2. Input sampled on the rising edge and output driven on the falling edge.

3. Input sampled on the falling edge and output driven on the falling edge (shown).

4. Input sampled on the falling edge and output driven on the rising edge.

Note: There are two possible timing conditions for SCC/SMC/I2C:

1. Input sampled on the falling edge and output driven on the falling edge (shown).

2. Input sampled on the falling edge and output driven on the rising edge.

new CLKin

MPC8271VR 数据表(PDF) 20 Page - Freescale Semiconductor, Inc