UPD17708 datasheet(292/356 Pages) NEC

292 / 356 page

292

µPD17704, 17705, 17707, 17708, 17709

20. STANDBY

The standby function is used to reduce the current consumption of the device while the device is backed up.

20.1 Outline of Standby Function

Figure 20-1 outlines the standby block.

The standby function reduces the current consumption of the device by partly or totally stopping the device

operation.

The following three types of standby functions are available for selection as the application requires.

•

Halt function

•

Clock stop function

•

Device operation control function by CE pin

The halt function reduces the current consumption of the device by stopping the CPU operation by using a dedicated

instruction “HALT h”.

The clock stop function reduces the current consumption of the device by stopping the oscillation of the oscillation

circuit by using a dedicated instruction “STOP s”.

The CE pin can be said to be one of the standby functions because it can be used to control the operation of the

PLL frequency synthesizer and to reset the device.

Figure 20-1. Outline of Standby Block

Interrupt control block

BTM0CY

P0D3/AD3

P0D2/AD2

P0D1/AD1

P0D0/AD0

Oscillation circuit

XOUT

XIN

Halt control circuit

HALT h

Clock stop

control circuit

STOP s

CPU

Program counter

ALU

System register

Control register

Instruction decoder

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