PC912XDP512F0MPVR datasheet(468/1348 Pages) FREESCALE

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)

MC9S12XDP512 Data Sheet, Rev. 2.21

468

Freescale Semiconductor

10.4.5.1

Operation in Run Mode

As shown in Table 10-36, only MSCAN sleep mode is available as low power option when the CPU is in

run mode.

10.4.5.2

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 its internal controllers 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). The MSCAN can also operate in any of the

low-power modes depending on the values of the SLPRQ/SLPAK and CSWAI bits as seen in Table 10-36.

10.4.5.3

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

(Table 10-36).

10.4.5.4

MSCAN Sleep Mode

The CPU can request the MSCAN to enter this low power mode by asserting the SLPRQ bit in the

CANCTL0 register. The time when the MSCAN enters sleep mode depends on a ﬁxed synchronization

delay and its current activity:

Table 10-36. CPU vs. MSCAN Operating Modes

CPU Mode

MSCAN Mode

Normal

Reduced Power Consumption

Sleep

Power Down

Disabled

(CANE=0)

RUN

CSWAI = X1

SLPRQ = 0

SLPAK = 0

1 ‘X’ means don’t care.

CSWAI = X

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

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