Enhanced Time Processing Unit (eTPU)MPC5566 Microcontroller Reference Manual, Rev. 218-10 Freescale Semiconductor— Global parameter address mode allows access to common channel data of up to 256 32-bitparameters (1024 bytes).— Support for indirect and stacked data access schemes.— Parallel execution of: data access, ALU, channel control and flow control subinstructions inselected combinations.— 24-bit registers and ALU, plus one 32-bit register for full-width SDM access.— Additional 24-bit multiply/MAC/divide unit which supports all signed/unsigned/multiply/MAC combinations, and unsigned 24-bit divide. The MAC/divide unit works inparallel with the regular microcode commands.• Resource sharing features resolve channel contention for common use of channel registers,memory and microengine time— Hardware scheduler works as a ‘task management’ unit, dispatching event service routines bypredefined, host-configured priority.— Hardware breakpoints on data access, qualified by address and/or data values.— Hardware breakpoints on instruction address.— Automatic channel context switch when a ‘task switch’ occurs; that is, one function thread endsand another begins to service a request from another channel. Channel-specific registers, flagsand parameter base address are automatically loaded for the next serviced channel.— Individual channel priority setting in three levels: high, middle, and low.— Scheduler priority scheme allows calculation of worst case latency for event servicing andensures servicing of all channels by preventing permanent blockage.— SDM shared between host core and both eTPU engines, supporting channel-channel orhost-channel communication.— Hardware implementation of four semaphores allows for resource arbitration between channelsin both eTPU engines.— Hardware semaphores are directly supported by the microengine instruction set.— Dual-parameter coherency hardware support allows coherent (to host) access to twoparameters by microengines in back-to-back accesses, or by Host CPU in 64-bit accesses.— Coherent dual-parameter controller allows coherent (to microengines) accesses to twoparameters by the host.• Test and development support features— Nexus level 3 debug support through the eTPU Nexus block (NDEDI)— Software breakpoints— SCM (code memory) continuous signature-check built-in code integrity test multiple inputsignature calculator (MISC): runs concurrently with eTPU normal operation18.2 Modes of OperationThe eTPU is capable of working in the following modes.
