MCP25020TE Просмотр технического описания (PDF) - Microchip Technology
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MCP25020TE Datasheet PDF : 66 Pages
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MCP2502X/5X
REGISTER 2-1:
TEC - TRANSMITTER ERROR COUNTER
R-0
R-0
R-0
R-0
TEC7
TEC6
TEC5
TEC4
bit 7
R-0
TEC3
R-0
TEC2
R-0
TEC1
R-0
TEC0
bit 0
bit 7-0
TEC7:TEC0: Transmit Error Counter bits
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
REGISTER 2-2:
REC - RECEIVER ERROR COUNTER
R-0
R-0
R-0
R-0
REC7 REC6 REC5 REC4
bit 7
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
R-0
REC3
R-0
REC2
R-0
REC1
R-0
REC0
bit 0
bit 7-0
REC7:REC0: Receive Error Counter bits
FIGURE 2-3:
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
BIT TIME PARTITIONING
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
Input Signal
Sync
Prop
Segment
TQ
Phase
Segment 1
Sample Point
Phase
Segment 2
2.4 Bit Timing Logic
The Bit Timing Logic (BTL) monitors the bus line input
and handles the bus-related bit timing based on the
CAN protocol. The BTL synchronizes on a recessive-
to-dominant bus transition at Start-of-Frame (hard
synchronization) and on any further recessive-to-
dominant bus line transition if the CAN controller itself
does not transmit a dominant bit (resynchronization).
The BTL also provides programmable time segments
to compensate for the propagation delay time, phase
shifts and to define the position of the sample point
within the bit time. These programmable segments are
made up of integer units called Time Quanta (TQ). The
nominal bit time is calculated by programming the TQ
length and the number of TQ in each time segment, as
discussed below.
2.4.1 TIME QUANTUM (TQ)
Time Quantum is a fixed unit of time derived from the
oscillator period. There is a programmable baud rate
prescaler (BRP) (with integral values ranging from 1 to
64) as well as a fixed division by two for clock
generation.
© 2007 Microchip Technology Inc.
DS21664D-page 7
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