AcroPack Series AP560
CAN Bus Interface Module
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BIT Timing Register 0
BTR0 defines the value of the Re-synchronization Jump Width (SJW) and the
Baud Rate Prescaler (BRP). This register can be read anytime and written only
in init mode (MODE<2:0> bits set to <1xx> in the CTRL0 register).
Table 19 BTR0 (Write 0x18, Read 0xD6)
BIT
FUNCTION
5:0
BRP 5:0
–
Baud Rate Prescaler bits <5:0>
The baud rate prescaler relates the system oscillator
frequency f
OSC
, to the CAN bit time as described in the bit
timing section.
000000
–
BRP = 1
000001
–
BRP = 2
⁞
111111
–
BRP = 64
7:6
SJW 1:0
–
Re-synchronization Jump Width bits <1:0>
These bits are used to compensate for phase shifts
between different clock oscillators on the bus. They define
the maximum number of time quanta (Tq) a bit can be
shortened or lengthened to allow a node achieve re-
synchronization to the edge of an incoming signal. Note
that one time quantum (Tq) is the single unit of time within
a bit time (see Bit Timing section).
00
–
SJW = 1 Tq
01
–
SJW = 2 Tq
10
–
SJW = 3 Tq
11
–
SJW = 4 Tq
Summary of Contents for AcroPack AP560
Page 28: ...AcroPack Series AP560 CAN Bus Interface Module 28 Figure 2 Standard Data Frame...
Page 30: ...AcroPack Series AP560 CAN Bus Interface Module 30 Figure 3 Extended Data Frame...
Page 32: ...AcroPack Series AP560 CAN Bus Interface Module 32 Figure 4 Remote Frame...
Page 34: ...AcroPack Series AP560 CAN Bus Interface Module 34 Figure 5 Error Frame...
