MC68MH360EM25L Freescale Semiconductor, MC68MH360EM25L Datasheet - Page 671

• Manufacturer Part Number: MC68MH360EM25L
• Description: IC MPU QUICC ETHER 25MHZ 240FQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360EM25L

• Processor Type: M683xx 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 240-FQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

MOT—Motorola
Res—Reserved. Should be set to zero by the user.
7.13.8.7 TRANSMITTER BUFFER DESCRIPTOR POINTER (TBPTR). The
buffer descriptor pointer (TBPTR) points to the next BD that the transmitter will transfer data
from when it is in IDLE state, or to the current BD during frame transmission. After a reset
or when the end of BD table is reached, the CP initializes this pointer to the value pro-
grammed in the TBASE entry. Although TBPTR need never be written by the user in most
applications, it may be modified by the user when the transmitter is disabled, or when the
user is sure that no transmit buffer is currently in use (i.e. after the STOP TRANSMIT com-
mand is issued.)
7.13.8.8 CENTRONICS TRANSMITTER PROGRAMMING MODEL. The host configures
the PIP to operate as a Centronics controller by programming the PIP Configuration register
(PIPC). Timing attributes (minimum data setup time and strobe pulse width) are set by pro-
gramming the PIP Timing Parameters register (PTPR). The transmit errors are reported
through the Tx BD.
7.13.8.9 CENTRONICS TRANSMITTER COMMAND SET. The
uses SMC2 transmit commands (i.e, same opcodes and channel number)
7.13.8.9.1 STOP TRANSMIT Command. The channel STOP TRANSMIT command dis-
ables the transmission of frames on the transmit channel. If this command is received by the
Centronics controller during frame transmission, transmission of that buffer is aborted and
the TBPTR is not advanced to the next BD. No new BD is accessed, and no new buffers are
transmitted for this channel. The transmitter will idle until the RESTART TRANSMIT com-
mand is given.
7.13.8.9.2 RESTART TRANSMIT Command. The RESTART TRANSMIT command is
used to begin or resume transmission from the current Tx BD Pointer (TBPTR) in the chan-
nel’s Tx BD table. When this command is received by the channel following by the STR bit
in the PIP Configuration register (PIPC) being set, it will start processing the current BD. This
command is expected by the Centronics controller after a STOP TRANSMIT command,
after the disabling of the channel in its mode register, or after a transmitter error occurs.
MOTOROLA
access as a DMA-type access. Example: FC3-FC0 = 1000 (binary). Do not write the value
0111 (binary) to these bits.
This bit should be set by the user to achieve normal operation.
0 = DEC (and Intel) convention is used for byte ordering. Swapped operation. Also
1 = Motorola byte ordering. Normal operation. Also called big-endian byte ordering. As
called little-endian byte ordering. The bytes stored in each buffer word are reversed
as compared to the Motorola mode.
data is received from the serial line and put into the buffer, the most significant byte
of the buffer word contains data received earlier than the least significant byte of
the same buffer word.
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68360 USER’S MANUAL
Go to: www.freescale.com
Centronics
Parallel Interface Port (PIP)
transmitter
transmitter
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