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型號(hào)：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁數(shù)：	862/1080頁
文件大?。?/td>	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

19.11.3 Example of using power saving modes

In some application systems, it may be necessary to place the CPU in a power saving mode to reduce the power

consumption. By using the power saving mode specific to the CAN module and the power saving mode specific to the

CPU in combination, the CPU can be woken up from the power saving status by the CAN bus.

Here is an example of using the power saving modes.

First, put the CAN module in the CAN sleep mode (PSMODE1, PSMODE0 bits = 01B). Next, put the CPU in the

power saving mode. If an edge transition from recessive to dominant is detected at the CRXD0 signal in this status,

the CINTS5 bit in the CAN module is set to 1. If the C0CTRL.CIE5 bit is set to 1, a wakeup interrupt (INTC0WUP) is

generated. The CAN module is automatically released from the CAN sleep mode (PSMODE1, PSMODE0 bits = 00B)

and returns to normal operation mode. The CPU, in response to INTC0WUP, can release its own power saving mode

and return to normal operation mode.

To further reduce the power consumption of the CPU, the internal clocks, including that of the CAN module, may

be tuned off. In this case, the operating clock supplied to the CAN module is turned off after the CAN module is put in

the CAN sleep mode. Then the CPU enters a power saving mode in which the clock supplied to the CPU is turned off.

If an edge transition from recessive to dominant is detected at the CRXD0 signal in this status, the CAN module can

set the CINTS5 bit to 1 and generate a wakeup interrupt (INTC0WUP) even if it is not supplied with a clock. The other

functions, however, do not operate because the clock supply to the CAN module is shut off, and the module remains

in the CAN sleep mode. The CPU, in response to INTC0WUP, releases its power saving mode, resumes supply of the

internal clocks, including the clock to the CAN module, after oscillation stabilization time has elapsed, and starts

instruction execution. The CAN module is immediately released from the CAN sleep mode when the clock supply is

resumed, and returns to normal operation mode (PSMODE1, PSMODE0 bits = 00B).

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