HT45F4M View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT45F4M

Lithium Battery Backup Power ASSP MCU

Holtek Semiconductor 

HT45F4M

Lithium Battery Backup Power ASSP MCU

Entering the IDLE0 Mode

There is only one way for the device to enter the IDLE0 Mode and that is to execute the “HALT”

instruction in the application program with the IDLEN bit in SMOD register equal to “1” and the

FSYSON bit in CTRL register equal to “0”. When this instruction is executed under the conditions

described above, the following will occur:

• The system clock will be stopped and the application program will stop at the “HALT” instruc­tion,

but the Time Base clock fTBC and the low frequency fSUB will be on.

• The Data Memory contents and registers will maintain their present condition.

• The WDT will be cleared and resume counting.

• The I/O ports will maintain their present conditions.

• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,

will be cleared.

Entering the IDLE1 Mode

There is only one way for the device to enter the IDLE1 Mode and that is to execute the “HALT”

instruction in the application program with the IDLEN bit in SMOD register equal to “1” and the

FSYSON bit in CTRL register equal to “1”. When this instruction is executed under the conditions

described above, the following will occur:

• The system clock together with the Time Base clock fTBC and the low frequency fSUB will be on

and the application program will stop at the “HALT” instruc­tion.

• The Data Memory contents and registers will maintain their present condition.

• The WDT will be cleared and resume counting.

• The I/O ports will maintain their present conditions.

• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,

will be cleared.

Rev. 1.10

38

January 15, 2013

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