Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manual De Usuario
Los códigos de productos
DEMO9S12XHY256
Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XHY-Family Reference Manual Rev. 1.04
Freescale Semiconductor
387
11.4.5.1
Operation in Run Mode
As shown in
, only MSCAN sleep mode is available as low power option when the CPU is in
run mode.
11.4.5.2
Operation in Wait Mode
The WAI instruction puts the MCU in a low power consumption stand-by mode. If the CSWAI bit is set,
additional power can be saved in power down mode because the CPU clocks are stopped. After leaving
this power down mode, the MSCAN restarts and enters normal mode again.
additional power can be saved in power down mode because the CPU clocks are stopped. After leaving
this power down mode, the MSCAN restarts and enters normal mode again.
While the CPU is in wait mode, the MSCAN can be operated in normal mode and generate interrupts
(registers can be accessed via background debug mode).
(registers can be accessed via background debug mode).
11.4.5.3
Operation in Stop Mode
The STOP instruction puts the MCU in a low power consumption stand-by mode. In stop mode, the
MSCAN is set in power down mode regardless of the value of the SLPRQ/SLPAK and CSWAI bits
(
MSCAN is set in power down mode regardless of the value of the SLPRQ/SLPAK and CSWAI bits
(
).
11.4.5.4
MSCAN Normal Mode
This is a non-power-saving mode. Enabling the MSCAN puts the module from disabled mode into normal
mode. In this mode the module can either be in initialization mode or out of initialization mode. See
mode. In this mode the module can either be in initialization mode or out of initialization mode. See
”.
Table 11-38. CPU vs. MSCAN Operating Modes
CPU Mode
MSCAN Mode
Normal
Reduced Power Consumption
Sleep
Power Down
Disabled
(CANE=0)
RUN
CSWAI = X
(1)
SLPRQ = 0
SLPAK = 0
1. ‘X’ means don’t care.
CSWAI = X
SLPRQ = 1
SLPRQ = 1
SLPAK = 1
CSWAI = X
SLPRQ = X
SLPAK = X
WAIT
CSWAI = 0
SLPRQ = 0
SLPAK = 0
CSWAI = 0
SLPRQ = 1
SLPAK = 1
CSWAI = 1
SLPRQ = X
SLPAK = X
CSWAI = X
SLPRQ = X
SLPAK = X
STOP
CSWAI = X
SLPRQ = X
SLPAK = X
CSWAI = X
SLPRQ = X
SLPAK = X