mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 101

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

Port configuration
register (PCR)
Sleep comparator
reference
33-mcan
Address:
CAF — MCAN asleep flag
When the COMPSEL bit in the MCAN command register ($21) is cleared
the sleep comparator inputs are the same as for the active comparator.
However, when the COMPSEL bit is set each input is compared with
V
details of the active comparator, the sleep comparator and VDDH, refer
to
Reset:
DD
ELECTRICAL
In order to minimize power consumption, the active comparator is
switched off and the sleep comparator circuitry is used to detect
activity on the bus. When in sleep mode the MCAN stops its own
clocks, leaving the MCU in normal run mode. (Similarly a STOP
instruction will stop the processor clocks, leaving the MCAN in run
mode.) The on-chip oscillator will stop only if the MCAN is in sleep
mode and the MCU executes a STOP instruction. There is a time
delay between the STOP instruction being executed and the oscillator
stopping. During this time it is possible that the MCAN will come out
of sleep mode, and hence prevent the oscillator from stopping.
When a dominant level is detected on the MCAN bus, the MCAN is
woken up and a wake-up interrupt is generated.
Freescale Semiconductor, Inc.
/2 (VDDH – see
For More Information On This Product,
1 = The MCAN is in sleep mode
0 = The MCAN is awake
$0003
Bit 7
-
Figure 22. Port Configuration Register (PCR)
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SPECIFICATIONS.
6
Motorola CAN
-
Figure
WOIF
5
0
21) to detect a dominant level. For further
TIMEN
4
0
CAF
3
0
BPDE
2
0
MC68HC05X4 Rev 1.0
BWE
1
0
Motorola CAN
Sleep mode
AWPS
Bit 0
0