MC68HC08AZ60CFU MOTOROLA [Motorola, Inc], MC68HC08AZ60CFU Datasheet - Page 321
MC68HC08AZ60CFU
Manufacturer Part Number
MC68HC08AZ60CFU
Description
Advance Information
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60CFU.pdf
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MSCAN08 Sleep
Mode
17-mscan
MOTOROLA
NOTE:
the CPU is in WAIT mode, the MSCAN08 is operated as in Normal
mode.
The CPU can request the MSCAN08 to enter the low-power mode by
asserting the SLPRQ bit in the module configuration register (see
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 sequesnce 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
Freescale Semiconductor, Inc.
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if it is transmitting, it continues to transmit untl 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
MSCAN Controller (MSCAN08)
Table 2. MSCAN08 vs CPU operating modes
Go to: www.freescale.com
1. ‘X’ means don’t care.
Power Down
Soft Reset
MSCAN
Normal
Mode
Sleep
SLPAK = X
SFTRES = X
STOP
CPU Mode
(1)
WAIT or RUN
SFTRES = 0
SFTRES = 1
SFTRES = 0
MSCAN Controller (MSCAN08)
SLPAK = 1
SLPAK = 0
SLPAK = 0
MC68HC08AZ60 — Rev 1.0
Low Power Modes
Figure
321
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