MC68MH360ZP33L Freescale Semiconductor, MC68MH360ZP33L Datasheet - Page 500

• Manufacturer Part Number: MC68MH360ZP33L
• Description: IC MPU 32BIT QUICC 357-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360ZP33L

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 357-PBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Freescale Semiconductor, Inc.
Serial Communication Controllers (SCCs)
when the transmitter is disabled. Note that the INIT TX AND RX PARAMETERS command
may also be used to reset both transmit and receive parameters.
7.10.17.6.2 Receive Commands. The following paragraphs describe the HDLC receive
commands.
ENTER HUNT MODE Command . After a hardware or software reset and the enabling of the
channel in the SCC mode register, the channel is in the receive enable mode and will use
the first BD in the table.
The ENTER HUNT MODE command is generally used to force the HDLC receiver to abort
reception of the current frame and enter the hunt mode. In the hunt mode, the HDLC con-
troller continually scans the input data stream for the flag sequence. After receiving the com-
mand, the current receive buffer is closed, and the CRC is reset. Further frame reception
will use the next BD.
CLOSE Rx BD Command . This command should not be used in the HDLC protocol.
INIT RX PARAMETERS Command . This command initializes all the receive parameters in
this serial channel’s parameter RAM to their reset state. This command should only be
issued when the receiver is disabled. Note that the INIT TX AND RX PARAMETERS com-
mand may also be used to reset both receive and transmit parameters.
7.10.17.7 HDLC ERROR-HANDLING PROCEDURE. The HDLC controller reports frame
reception and transmission error conditions using the channel BDs, the error counters, and
the HDLC event register.
7.10.17.7.1 Transmission Errors. The following paragraphs describe various types of
HDLC transmission errors.
Transmitter Underrun . When this error occurs, the channel terminates buffer transmission,
closes the buffer, sets the underrun (U) bit in the BD, and generates the TXE interrupt if it is
enabled. The channel will resume transmission after reception of the RESTART TRANSMIT
command. The transmit FIFO size is 32 bytes on SCC1 and 16 bytes on SCC2, SCC3, and
SCC4.
CTS Lost During Frame Transmission . When this error occurs, the channel terminates
buffer transmission, closes the buffer, sets the CT bit in the BD, and generates the TXE
interrupt if it is enabled. The channel will resume transmission after reception of the
RESTART TRANSMIT command.
If this error occurs on the first or second buffer of the frame and the RTE bit in the HDLC
mode register is set, the channel will retransmit the frame when the CTS line becomes active
again. When working in an HDLC mode with collision possibility, to ensure the retransmis-
sion method functions properly, the first and second data buffers should contain more than
36 bytes of data (SCC1), and 20 bytes of data (SCC2, SCC3, and SCC4) if multiple buffers
per frame are used. (Small frames consisting of a single buffer are not subject to this require-
ment.) The channel will also increment the retransmission counter.
7-176
MC68360 USER’S MANUAL
MOTOROLA
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