MC68HC58 Motorola, MC68HC58 Datasheet - Page 79

• Manufacturer Part Number: MC68HC58
• Description: Data Link Controller
• Manufacturer: Motorola

5.4.3.3 Transmitter Lost Arbitration
5.4.3.4 Transmitter Successful
5.4.4 IFR — In-Frame Response Bit
5.4.5 IFRC — In-Frame Response CRC Bit
5.4.6 ERRC[1:0] — Error Code Field
5.4.6.1 CRC Error
5.4.6.2 Incomplete Byte Error
MC68HC58
TECHNICAL DATA
This value indicates that the transmitter lost contention, or an RxFIFO buffer overrun
occurred. If overrun occurred, transmitter may not have been arbitrated against, and
transmission may not have stopped.
This value indicates that a frame transmitted successfully. Frame originated from this
node.
This bit indicates whether or not a frame is an IFR.
This bit indicates whether or not an IFR has an appended cyclic redundancy check.
This bit field is used in conjunction with the error flag. It indicates which errors were
detected. Errors are reported in precedence order; the higher the ERRC value, the
higher the priority. If any of these error conditions are detected, a pending EOD re-
sponse frame (IFR) is not sent. Table 5-8 shows the ERRC encoding field.
This value indicates that the cyclic redundancy check is incorrect or that a receiver
overrun has occurred.
This value indicates that an incorrect modulus eight count occurred during reception
of this frame, and that an incomplete byte was received.
0 = Not an IFR
1 = IFR
0 = IFR without CRC
1 = IFR with CRC
Value
00
01
10
11
Table 5-8 ERRC Field Encoding
CONTROL AND STATUS CODES
Incomplete byte
Bit timing error
Description
CRC error
Break
MOTOROLA
5-13