MC68HC912B32MFU8 MOTOROLA [Motorola, Inc], MC68HC912B32MFU8 Datasheet - Page 101

• Manufacturer Part Number: MC68HC912B32MFU8
• Description: 16-Bit Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

RX4XE — Receive 4X Enable
NBFS — Normalization Bit Format Select
TEOD — Transmit End of Data
TSIFR, TMIFR1, TMIFR0 — Transmit In-Frame Response Control
MC68HC912B32
MC68HC912B32TS/D
Reception of a BREAK symbol automatically clears this bit and sets the BSVR register to $1C.
Controls the format of the normalization bit.
Marks the end of a BDLC message by appending an 8-bit CRC after completing transmission of the
current byte. This bit is also used to end an IFR transmission.
Controls the type of in-frame response being sent. If more than one bit is set, the bits will be interpreted
according to Table 34 although the bits can be read back as they were set.
The BDLC supports the in-frame response (IFR) features of J1850. The four types of J1850 IFR are
shown below.
0 = BDLC transmits and receives at 10.4 kbps
1 = BDLC is in 4X receive only operation
0 = Normalization bit is a zero (0) when the response part of an in-frame response (IFR) does not
1 = Normalization bit is a one (1) when the response part of an in-frame response (IFR) does not
0 = TEOD is automatically cleared at the rising edge of the first CRC bit or if an error is detected.
1 = Transmit EOD symbol
end with a CRC byte. Normalization bit is a one (1) when the response part of an in-frame re-
sponse (IFR) ends with a CRC byte.
end with a CRC byte. Normalization bit is a zero (0) when the response part of an in-frame re-
sponse (IFR) ends with a CRC byte.
When TEOD is used to end an IFR transmission, TEOD is cleared when the BDLC receives
back a valid EOD symbol or an error condition occurs.
Shaded cells indicate bits which do not affect internal interpretation. These bits will be read
back as written.
TSIFR
Table 34 Transmit In-Frame Response Control Bit Priority Encoding
0
1
0
0
Write/Read
TMIFR1
0
1
0
TMIFR0
0
1
TSIFR
0
1
0
0
Internal Interpretation
TMIFR1
0
0
1
0
TMIFR0
0
0
0
1
MOTOROLA
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