TMP86FS64FG datasheet(40/252 Pages) TOSHIBA

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Page 28

2. Operational Descriptions

2.2 System Clock Controller

TMP86FS64FG

• Entering IDLE1/2 or SLEEP1/2 mode

After clearing the interrupt master enable flag (IMF) to 0, set the individual interrupt enable

flag used to exit the IDLE1/2 or SLEEP1/2 mode to 1.

To enter the EDLE1/2 or SLEEP1/2 mode, set SYSCR2<IDELE> to 1.

• Exiting IDLE1/2 or SLEEP1/2 Mode

Upon return from the IDEL1/2 or SLEEP1/2 mode, the interrupt master enable flag (IMF)

determines the action taken after exiting the IDLE1/2 or SLEEP1/2 mode; i.e., whether execu-

tion resumes with an interrupt service routine. When exiting the IDLE1//2 or SLEEP1/2 mode,

SYSCR2<IDLE> is automatically cleared to 0, and the operating mode is returned to the mode

before entering the IDLE1/2 or SLEEP1/2 mode.

The IDLE1/2 or SLEEP1/2 mode is exited by setting the RESET pin to low. In this case,

the NORMAL1 mode is activated after exitig the IDLE1/2 or SLEEP1/2.

(1) Program execution resuming with the instruction (IMF = 0)

The IDLE1/2 or SLEEP1/2 mode is exited by the individual interrupt enable flag (EF). Program

execution resumes with the instruction immediately following the instruction that activated the

IDLE1/2 or SLEEP1/2 mode. Normally the instruction latches (IL) of the interrupt source used to

exit the IDLE1/2 or SLEEP1/2 mode must be cleared to 0 by the load instruction.

(2) Program execution resuming with the interrupt service routine (IMF = 1)

The IDEL1/2 or SLEEP1/2 mode is exited by an interrupt source enabled by the individual inter-

rupt enable flag (EF). Execution resumes with the interrupt service routine. Upon completion of the

interrupt service routine, program execution resumes with the instruction immediately following the

instruction that activated the IDEL1/2 or SLEEP1/2 mode.

Note: When a watchdog timer interrupt is generated immediately before entering the IDEL1/2 or

SLEEP1/2 mode, the watchdog timer interrupt is processed without entering the IDEL1/2 or

SLEEP1/2 mode.

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