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
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•
•
— 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.
MPC875/MPC870 Hardware Specifications, Rev. 3.0
4
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Freescale Semiconductor
FREESCALE [ Freescale ]
