MPC850 datasheet(5/72 Pages) FREESCALE

5 / 72 page

MPC850 PowerQUICC™ Integrated Communications Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Features

— Gate mode can enable/disable counting

— Interrupt can be masked on reference match and event capture

•

Interrupts

— Eight external interrupt request (IRQ) lines

— Twelve port pins with interrupt capability

— Fifteen internal interrupt sources

— Programmable priority among SCCs and USB

— Programmable highest-priority request

•

Single socket PCMCIA-ATA interface

— Master (socket) interface, release 2.1 compliant

— Single PCMCIA socket

— Supports eight memory or I/O windows

•

Communications processor module (CPM)

— 32-bit, Harvard architecture, scalar RISC communications processor (CP)

— Protocol-specific command sets (for example, GRACEFUL STOP TRANSMIT stops transmission

after the current frame is finished or immediately if no frame is being sent and CLOSE RXBD

closes the receive buffer descriptor)

— Supports continuous mode transmission and reception on all serial channels

— Up to 8 Kbytes of dual-port RAM

— Twenty serial DMA (SDMA) channels for the serial controllers, including eight for the four

USB endpoints

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

•

Four independent baud-rate generators (BRGs)

— Can be connected to any SCC, SMC, or USB

— Allow changes during operation

— Autobaud support option

•

Two SCCs (serial communications controllers)

— Ethernet/IEEE 802.3, supporting full 10-Mbps operation

— HDLC/SDLC™ (all channels supported at 2 Mbps)

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

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

— AppleTalk®

— Universal asynchronous receiver transmitter (UART)

— Synchronous UART

— Serial infrared (IrDA)

— Totally transparent (bit streams)

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

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