MPC875 datasheet(4/84 Pages) FREESCALE

4 / 84 page

MPC875/MPC870 Hardware Specifications, Rev. 3.0

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Freescale Semiconductor

Features

— 12 port pins with interrupt capability

— 23 internal interrupt sources

— Programmable priority between SCCs

— Programmable highest priority request

•

Communications processor module (CPM)

— RISC controller

— Communication-specific commands (for example, GRACEFUL STOP TRANSMIT, ENTER HUNT MODE, and

RESTART TRANSMIT

)

— Supports continuous mode transmission and reception on all serial channels

— 8-Kbytes of dual-port RAM

— Several serial DMA (SDMA) channels to support the CPM

— Three parallel I/O registers with open-drain capability

•On-chip 16

× 16 multiply accumulate controller (MAC)

— One operation per clock (two-clock latency, one-clock blockage)

— MAC operates concurrently with other instructions

— FIR loop—Four clocks per four multiplies

•

Four baud-rate generators

— Independent (can be connected to any SCC or SMC)

— Allows changes during operation

— Autobaud support option

•

SCC (serial communication controller)

— Ethernet/IEEE 802.3 optional on the SCC, supporting full 10-Mbps operation

— HDLC/SDLC

— HDLC bus (implements an HDLC-based local area network (LAN))

— Asynchronous HDLC to support point-to-point protocol (PPP)

—AppleTalk

— Universal asynchronous receiver transmitter (UART)

— Synchronous UART

— Serial infrared (IrDA)

— Binary synchronous communication (BISYNC)

— Totally transparent (bit streams)

— Totally transparent (frame based with optional cyclic redundancy check (CRC))

•

SMC (serial management channel)

— UART (low-speed operation)

— Transparent

•

Universal serial bus (USB)—Supports operation as a USB function endpoint, a USB host controller, or both

for testing purposes (loopback diagnostics)

— USB 2.0 full-/low-speed compatible

— The USB function mode has the following features:

– Four independent endpoints support control, bulk, interrupt, and isochronous data transfers.

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