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Chapter 14 CAN Sampler
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
241
14.4.3
Baud rate generation
Sampling is performed at a baud rate that is set by the software as a multiple of RC oscillator frequency of
62.5 ns (assuming RC is configured for high frequency mode, that is, 16 MHz). User must set the baud
rate prescaler (BRP) such that 8 samples per bit are achieved.
Baud rate setting must be made by software before going into standby or stop mode. This is done by setting
BRP bits 5:1 in Control register. The reset value of BRP is 00000 and can be set to maximum value of
11111, which gives a prescale value of BRP + 1 thus providing a BRP range of 1 to 32.
•
Maximum bit rate supported for sampling is 2 Mbit/s using BRP as 1
•
Minimum bit rate supported for sampling is 62.5 kbit/s using BRP as 32
For example, suppose the system is transmitting at 125 kbit/s. In this case, nominal bit period:
T=1/(125 × 10
3
)s = 8 × 10
–3
× 10
–3
s = 8 µs
Eqn. 14-1
To achieve 8 samples per bit
Sample period= 8/8 µs = 1 µs
BRP = 1 µs/62.5 ns = 16. Thus in this case BRP = 01111
011
CAN3RX on PE[9]
100
CAN4RX on PC[11]
101
CAN5RX on PE[0]
110
Rx6
111
Rx7
Table 14-3. Internal multiplexer correspondence (continued)
CAN_RX_SEL
Rx selected
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