mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 89

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MCAN bus timing
register 1 (CBT1)
21-mcan
OSC1
f
osc
Address:
This register can only be accessed only when the RR bit in CCNTRL is
set.
SAMP — Sampling
TSEG22 – TSEG10 — Time segment bits
Divide by
Divide by
Reset:
10 or 2
This bit determines the number of samples of the serial bus to be
taken per bit time. When set three samples per bit are taken. This
sample rate gives better rejection of noise on the bus, but introduces
a one bit delay to the bus sampling. For higher bit rates SAMP should
be cleared, which means that only one sample will be taken per bit.
Time segments within the bit time fix the number of clock cycles per
bit time, and the location of the sample point.
Freescale Semiconductor, Inc.
2
Figure 11. Oscillator block diagram
For More Information On This Product,
1 = Three samples per bit.
0 = One sample per bit.
$0027
SAMP
Bit 7
Go to: www.freescale.com
Figure 12. MCAN Bus Timing 1 (CBT1)
f
f
MCU bus clock
osc
OP
TSEG22
/2
6
Motorola CAN
TSEG21
5
TSEG20
Prescaler (P)
4
Undefined
TSEG13
Interface to the MC68HC05X4 CPU
3
MCAN module system clock
TSEG12
2
MC68HC05X4 Rev 1.0
TSEG11
t
SCL
1
Motorola CAN
=
TSEG10
f
2P
osc
Bit 0