MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 121
MC68000
Manufacturer Part Number
MC68000
Description
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68000.pdf
(480 pages)
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SECTION 4
COMMUNICATIONS PROCESSOR (CP)
The CP includes the following modules:
4.1 MAIN CONTROLLER
The CP main controller is a RISC processor that services the three SCCs, the SCP, and the
SMCs. Its primary responsibilities are to work with the serial channels to implement the user-
chosen protocol and to manage the SDMA channels that transfer data between the SCCs
and memory. The CP main controller also executes commands issued by the M68000 core
(or an external processor) and generates interrupts to the interrupt controller.
The operation of the main controller is transparent to the user, executing microcode located
in a private internal ROM (see Figure 4-1). Commands may be explicitly written to the main
controller by the M68000 core through the CP command register. Additionally, commands
and status are exchanged between the main controller and the M68000 core through the
MOTOROLA
• Main Controller (RISC Processor)
• Six Serial Direct Memory Access (SDMA) Channels
• A Command Set Register
• Serial Channels Physical Interface Including:
• Three Independent Full Duplex Serial Communication Controllers (SCCs) Supporting
• Serial Communication Port (SCP) for Synchronous Communication
• Two Serial Management Controllers (SMCs) to Support the IDL and GCI Management
—Motorola Interchip Digital Link (IDL)
—General Circuit Interface (GCI), also known as IOM-2
—Pulse Code Modulation (PCM) Highway Interface
—Nonmultiplexed Serial Interface (NMSI) Implementing Standard
—Modem Signals
the Following Protocols:
—High-Level/Synchronous Data Link Control (HDLC/SDLC)
—Universal Asynchronous Receiver Transmitter (UART)
—Binary Synchronous Communication (BISYNC)
—Synchronous/Asynchronous Digital Data Communications Message
—Protocol (DDCMP)
—Transparent Modes
—V.110 Rate Adaption
Channels
MC68302 USER’S MANUAL
4-1
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