MC68HC05X4 Datasheet, PDF (92/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Motorola CAN
Freescale Semiconductor, Inc.
MCAN output
control register
(COCNTRL)
This register allows the setup of different output driver configurations
under software control. The user may select active pull-up, pull-down,
float or push-pull output.
NOTE: This register can be accessed only when the RR bit in CCNTRL is set.
Address: $0028
Bit 7
6
5
4
3
2
1
OCTP1 OCTN1 OCPOL1 OCTP0 OCTN0 OCPOL0 OCM1
Reset:
Undefined
Figure 14. MCAN Output Control (COCNTRL)
Bit 0
OCM0
OCM1 and OCM0 — Output control mode bits
The values of these two bits determine the output mode, as shown in
Table 4.
Table 4. Output control modes
OCM1
0
0
1
1
OCM0
Function
0 Biphase mode
1 Not used
Normal mode 1
0
Bit stream transmitted on both TX0 and
TX1
Normal mode 2
1
TX0 – bit sequence
TX1 – bus clock (t_xclk)
NOTE: The transmit clock (t_xclk) is used to indicate the end of the bit time and will
be high during the SYNC_SEG.
For all the following modes of operation, a dominant bit is internally
coded as a zero, a recessive as a one. The other output control bits are
used to determine the actual voltage levels transmitted to the MCAN bus
for dominant and recessive bits.
MC68HC05X4
Motorola CAN
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