MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 407

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

24.9.1 MSCAN08 Sleep Mode
68HC908AZ32A — Rev 0.0
MOTOROLA
NOTE:
The CPU can request the MSCAN08 to enter the low-power mode by
asserting the SLPRQ bit in the module configuration register (see
24-6). The time when the MSCAN08 enters Sleep mode depends on its
activity:
The application software must avoid setting up a transmission (by
clearing or more TXE flags) and immediately request Sleep mode (by
setting SLPRQ). It then depends on the exact sequence of operations
whether MSCAN08 starts transmitting or goes into Sleep mode directly.
During Sleep mode, the SLPAK flag is set. The application software
should use SLPAK as a handshake indication for the request (SLPRQ)
to go into Sleep mode. When in Sleep mode, the MSCAN08 stops its
internal clocks. However, clocks to allow register accesses still run. If the
1. ‘X’ means don’t care.
Power Down
Freescale Semiconductor, Inc.
•
•
•
Soft Reset
MSCAN
Normal
Mode
Sleep
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if it is transmitting, it continues to transmit until there is no more
message to be transmitted, and then goes into Sleep mode
if it is receiving, it waits for the end of this message and then goes
into Sleep mode
if it is neither transmitting or receiving, it will immediately go into
Sleep mode
Table 24-2. MSCAN08 vs CPU operating modes
MSCAN Controller (MSCAN08)
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Table 24-3
SLPAK = X
SFTRES = X
STOP
CPU Mode
(1)
WAIT or RUN
SFTRES = 0
SFTRES = 1
SFTRES = 0
SLPAK = 1
SLPAK = 0
SLPAK = 0
MSCAN Controller (MSCAN08)
Advance Information
Low Power Modes
Figure
407