Fujitsu F2MCTM-16LX Manuel d'utilisateur télécharger pdf (Page 175)

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CHAPTER 8 LOW-POWER CONSUMPTION MODE

The devices does not guarantee its operation after returning from the standby mode if you place an array

of instructions other than the one enclosed in the line.

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To access the low-power consumption mode control register (LPMCR) with C language

To enter the standby mode using the low-power consumption mode control register (LPMCR), use one

of the following methods 1. to 3. to access the register:

1. Specify the standby mode transition instruction as a function and insert two __wait_nop() built-in

functions after that instruction. If any interrupt other than the interrupt to return from the standby mode

can occur within the function, optimize the function during compilation to suppress the LINK and

UNLINK instructions from occurring.

Example: Watch mode or timebase timer mode transition function

2. Define the standby mode transition instruction using __asm statements and insert two NOP and JMP

instructions after that instruction.

Example: Transition to sleep mode

3. Define the standby mode transition instruction between #pragma asm and #pragma endasm and insert

two NOP and JMP instructions after that instruction.

Example: Transition to stop mode

void enter_watch(){

IO_LPMCR.byte = 0x10; /* Set LPMCR TMD bit to 0 */

__wait_nop();

}

__asm("MOV I:_IO_LPMCR, #H’ 58); /* Set LPMCR SLP bit to 1 */

__asm("NOP");

__asm("OP");

__asm("JMP $+3"); /* Jump to the next instruction*/

#pragma asm

MOV I:_IO_LPMCR, #H’ 98 /* Set LPMCR STP bit to 1 */

NOP

JMP $+3 /* Jump to the next instruction */

#pragma endasm

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Fujitsu F2MCTM-16LX Manuel d'utilisateur Page 175

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