XPC8255ZUIFBC Datasheet, PDF (15/41 Pages) Texas Instruments – PowerQUICC II Integrated Communications Processor Hardware Specifications

Figure 5 shows the SCC/SMC/SPI/I²C external clock.
Electrical and Thermal Characteristics
Serial CLKin
SCC/SMC/SPI/I2C input signals
(See note)
SCC/SMC/SPI/I2C output signals
(See note)
sp18b
sp19b
sp38b/sp39b
Note: There are four possible timing conditions for SCC and SPI:
1. Input sampled on the rising edge and output driven on the rising edge (shown).
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.
4. Input sampled on the falling edge and output driven on the rising edge.
Figure 5. SCC/SMC/SPI/I²C External Clock Diagram
Figure 6 shows the SCC/SMC/SPI/I²C internal clock.
BRG_OUT
SCC/SMC/SPI/I2C input signals
(See note)
sp18a
sp19a
sp38a/sp39a
SCC/SMC/SPI/I2C output signals
(See note)
Note: There are four possible timing conditions for SCC and SPI:
1. Input sampled on the rising edge and output driven on the rising edge (shown).
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.
4. Input sampled on the falling edge and output driven on the rising edge.
Figure 6. SCC/SMC/SPI/I²C Internal Clock Diagram
MPC8260 PowerQUICC II Integrated Communications Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
15