GMS81608PL datasheet(47/79 Pages) HYNIX

47 / 79 page

Basic interval timer is activated on wake-up. It is

incremented from 00H until FFH then 00H. The count

overflow is set to start normal operation. Therefore,

before STOP instruction, user must be set its relevant

prescaler divide ratio to have long enough time (more

than 20msec). This guarantees that crystal oscillator

has started and stabilized.

By reset, exit from Stop mode is shown in Figure 38.

M inimizing Current Consumption in

Stop Mode

The Stop mode is designed to reduce power consump-

tion. 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.

Wake-up and Reset Function Table

Event

Chip Status

before event

Chip function after event

Oscillator

Circuit

RESET

Do not care

Vector

STOP instruction

Normal operation

N+1

off

External Interrupt

Normal operation

Vector

External Interrupt Wake-up

Stop, I-flag = 1

Stop, I-flag = 0

Vector

N+1

PC: Program Counter contents after the event.

N: Address of STOP instruction.

STOP MODE

RESET

INTERNAL

CLOCK

OSCILLATOR

STOP INSTRUCTION

EXECUTION

tST = 64 ms

at 8 MHz

STABILIZATION TIME

Time can not be control by software.

Figure 38. Timing of Stop Mode Release by Reset

LG Semicon

GMS81604/08

GMS81608PL Datasheet(PDF) 47 Page - Hynix Semiconductor

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