GMS81C2012 datasheet(77/92 Pages) HYNIX

77 / 92 page

Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

Figure 21-3 Application Example of Unused Input Port

Minimizing Current Consumption in Stop Mode

The Stop mode is designed to reduce power consumption.

To minimize current drawn during Stop mode, the user

should turn-off output drivers that are sourcing or sinking

current, if it is practical. Weak pull-ups on port pins should

be turned off, if possible. All inputs should be either as

VSS or at VDD (or as close to rail as possible).

An intermediate voltage on an input pin causes the input

buffer to draw a significant amount of current.

Figure 21-4 Timing of STOP Mode Release by External Interrupt

OUTPUT PIN

GND

In the left case, much current flows from port to GND.

OFF

OUTPUT PIN

GND

In the left case, Tr. base current flows from port to GND.

i=0

OFF

VDD

OFF

OPEN

GND

VDD

OFF

To avoid power consumption, there should be low output

OFF

VDD

to the port .

STOP Mode

Normal Operation

Oscillator

(XI pin)

N+1

NN+2

N-1

N-2

Clear Basic Interval Timer

STOP Instruction Execution

Normal Operation

Stabilization Time

tST > 20mS

Internal

Clock

External

Interrupt

BIT

Counter

GMS81C2012 数据表(PDF) 77 Page - Hynix Semiconductor

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