Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 835

Powerquicc family

Table of Contents

• All signals are open-drain

• For a multi-master system with more than two masters, SPISEL and SPIE[MME]

will not detect all possible conflicts

• It is the responsibility of software to arbitrate for the SPI bus (with token passing, for example)

• SELOUTx signals are implemented in software with general-purpose I/O signals

Freescale Semiconductor

Figure 30-3. Multimaster Configuration

MPC885 PowerQUICC Family Reference Manual, Rev. 2

Serial Peripheral Interface (SPI)