MC68HC05X4 Datasheet, PDF (79/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Motorola CAN
Interface to the MC68HC05X4 CPU
MCAN command
register (CCOM)
This is a write only register; a read of this location will always return
the value $FF.
This register may be written only when the RR bit in CCNTRL is clear.
Do not use read-modify-write instructions on this register (e.g. BSET,
BCLR).
Address: $0021
Bit 7
6
5
4
3
2
1
Bit 0
RX0
RX1 COMPSEL SLEEP COS RRB
AT
TR
External Reset: 0
0
u
0
0
0
0
0
Reset: with RR bit set 0
0
u
0
0
0
0
0
Figure 5. MCAN Command Register (CCOM)
RX0 — Receive pin 0 (passive) (Refer to Figure 21)
1 = VDD/2 will be connected to the input comparator. The RX0 pin
is disconnected.
0 = The RX0 pin will be connected to the input comparator. VDD/2
is disconnected.
RX1 — Receive pin 1 (passive) (Refer to Figure 21)
1 = VDD/2 will be connected to the input comparator. The RX1 pin
is disconnected.
0 = The RX1 pin will be connected to the input comparator. VDD/2
is disconnected.
NOTE: If both RX0 and RX1 are set, or both are clear, then neither of the RX
pins will be disconnected.
COMPSEL — Comparator selector
1 = RX0 and RX1 will be compared with VDD/2 during sleep mode
(see Figure 21).
0 = RX0 will be compared with RX1 during sleep mode.
11-mcan
Motorola CAN
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Go to: www.freescale.com
MC68HC05X4 Rev 1.0