Motorola MPC533 Reference Manual page 801

Chapter 18
Peripheral Pin Multiplexing (PPM) Module
The peripheral pin multiplexing (PPM) module has two main functions. The first function
allows the PPM to act as a parallel-to-serial communications module. Using the PPM in this
way can reduce the number of signals required to connect the MPC533 to an external device
or devices. The second function allows the PPM to short internal signals thus giving
increased access to multiple functions multiplexed on the same device signal.
18.1 Key Features
• Synchronous serial interface between MCU and an external device
• Two internal parallel data sources can be multiplexed through the PPM
— MIOS: 12 PWM channels, four MDA channels
— Internal GPIO: 16 general-purpose inputs, 16 general-purpose outputs
• Software configurable stream size
— One 16-bit transmit stream and one 16-bit receive stream
— Two parallel 8-bit transmit streams and two parallel 8-bit receive streams
• Software configurable clock (TCLK) based on system clock
• Software selectable clock modes
— Serial peripheral interface (SPI) mode
— Time division multiplexing (TDM) mode
• Software selectable operation modes
— Continuous mode – Continuously transmit/receive data through PPM
— Start-transmit-receive (STR) mode – transmit/receive only when STR mode
selected
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Chapter 18. Peripheral Pin Multiplexing (PPM) Module 18-1