LC6514B Просмотр технического описания (PDF) - SANYO -> Panasonic

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LC6514B

Single-Chip 4-bit Microcontroller (Low-Threshold Input, On-Chip FLT Driver)

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LC6514B

<Notes for Standby Fuction Application>

[Proper cares in using standby function]

The LC6514B provides the standby function called HALT, HOLD mode to minimize the current drain when the

program is in the wait state. The standby function is controlled by the HALT instruction, the HOLD pin, RES pin. A

peripheral circuit and program must be so designed as to provide precise control of the standby function. In most

applications where the standby function is performed, voltage regulation, instantaneous break of power, and external

noise are not negligible. When designing an application circuit and program, whether or not to take some measures

must be considered according to the extent to which these factors are allowed.

This section mainly describes power failure backup for which the satndby function is mostly used. A sample applica-

tion circuit where the standby function is performed precisely is shown below and notes for circuit design and pro-

gram design are also given below. When using the standby function, the application circuit shown below must be used

and the notes must be also fully observed. If any other method than shown in this section is applied, it is necessary to

fully check the environmental conditions such as power failure and the actual operation of an application equipment.

[Sample application and notes]

When using the HOLD mode, an appliacation circuit and program must be designed with the following in mind.

(1) The supply voltage at the standby state must not be less than specified.

(2) Input timing of each control signal (HOLD, RES port A, INT, etc.) at the standby initiate/release state.

(3) Release operation must not be overlapped at the time of execution of the HALT instruction.

A sample application where the standby function is used for power failure backup is shown below as a concrete

method to observe these notes. A sample application circuit, its operation, and notes for program design are given

below.

1. Sample application where the standby function is used for power failure backup.

Power failure backup is an application where power failure of the main power source is detected by the HOLD pin,

etc. to cause the HOLD mode to be entered so that the current drain is minimized and a backup capacitor is used to

retain the contents of the internal registers even during power failure.

1-1. Sample application circuit (CF OSC)

Fig. 11 shows a CF OSC-applied circuit where the standby function is used for power failure backup.

Unit (resistance : Ω, capacitance : F)

Fig. 11 Sample Application Circuit

No.1802–10/17

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