MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 349
MC68000
Manufacturer Part Number
MC68000
Description
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68000.pdf
(480 pages)
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C.3 CENTRONICS
With this package, SCC2 is turned into an interface that can receive Centronics data. This
package, for example, could be used in a laser printer design requiring a Centronics inter-
face option. The package uses SCC2 (its pins and registers) in addition to PA12, PA13 or
PA11, PA14, and PA15.
The main features are as follows:
C.4 PROFIBUS CONTROLLER
Process field bus (PROFIBUS) is a UART-based master-slave protocol that specifies data
rates starting at 9.6 kbps. The PROFIBUS microcode running on the IMP RISC controller
assists the M68000 core in handling some of the time-critical PROFIBUS link layer func-
tions, leaving more of the M68000 core available for the application software.
The main PROFIBUS controller features are as follows:
C.5 AUTOBAUD SUPPORT PACKAGE
The package allows a UART to automatically detect the baud rate of a serial stream and ad-
just to it. This is useful in modem applications that must support an autobaud capability. It is
MOTOROLA
• Flexible Message-Oriented Data Structure
• Flexible Control Character Comparison
• Controls the BUSY and ACK Signals
• Three Timing Relationships Possible between BUSY and ACK
• Supports the SET_BUSY and CLEAR_BUSY Commands
• Programmable Duration (in clock cycles) of the ACK Signal
• Receive Buffer May Be Closed upon a Programmable Silence Period
• Automatic Frame Synchronization by Searching for the Start Delimiter
• Frame Preceding IDLE Sequence Generation/Checking
• Flexible Frame-Oriented Data Buffers
• Separate Interrupts for Frames and Buffers (Receive and Transmit)
• Maintenance of Six 16-Bit Error Counters
• Two Address Comparison Registers with Mask
• Frame Error, Noise Error, Parity Error Detection
• Detection of IDLE in the Middle of a Frame
• Check Sum Generation/Checking
• End Delimiter (ED) Generation/Checking
• Three Commands
1.
Centronics is a trademark of Centronics.
1
RECEPTION CONTROLLER
MC68302 USER’S MANUAL
RISC Microcode from RAM
C-3
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