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4-82
I -
Interrupt
1 =The M68000 core will be interrupted when this buffer has been serv-
iced by the CP.
0 =No interrupt is generated after this buffer has been serviced.
L -
Last in Message
1 =The last character in the buffer is the last character in the current
block. The transmitter will enter (remain in) normal mode after send-
ing the last character in the buffer and the BCS (if enabled).
0 =The last character in the buffer is not the last character in the current
block.
TB - Transmit BCS
This bit is valid only when the L bit is set.
1 =Transmit the BCS sequence after the last character. The B!SYNC con-
troller will also reset the BCS generator after transmitting the BCS
sequence.
O=Transmit the SYN1-SYN2 sequence or IDLE (according to the SYNF
bit in the BISYNC mode register) after the last character in the buffer.
B -
BCS Enable
1 =Buffer consists of characters to be included in the BCS accumulation.
0 =Buffer consists of characters to be excluded from the BCS accumu-
lation.
BR -
BCS Reset
1 =The transmitter BCS accumulation is reset (used for STX or SOH)
before sending the data buffer.
0 =The BCS accumulation is not reset.
TD - Transmit DLE
1 =The transmitter will transmit a DLE character before sending the data
buffer, which saves writing the first DLE to a separate data buffer
when working in transparent mode.
0 =No automatic DLE transmission before the data buffer.
TR - Transparent Mode
1 =The transmitter enters or remains in transparent mode after sending
the data buffer. In this mode, the transmitter automatically inserts
DLE-SYNC pairs in the underrun condition. Underrun occurs when
the BISYNC controller finishes a buffer with L set to zero and the next
BD is not available. The transmitter also checks all characters before
sending them; if a DLE is detected, another DLE is automatically sent.
MC68302 USER'S MANUAL
MOTOROLA
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