參數(shù)資料
型號： GMS81516BK
廠商： Hynix Semiconductor Inc.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 72/110頁
文件大小： 1980K
代理商： GMS81516BK
GMS81508B/16B/24B, GMS82512/16/24
MAY. 2001 Ver 2.0
69
18. POWER DOWN OPERATION
GMS815xxB has a power-down mode. In power-down
mode, power consumption is reduced considerably that in
battery operation. Battery life can be extended a lot.
STOP Mode is entered by STOP instruction.
18.1 STOP Mode
For applications where power consumption is a critical
factor, device provides reduced power of STOP.
Start The Stop Operation
An instruction that STOP causes to be the last instruction
is executed before going into the STOP mode. In the Stop
mode, the on-chip main-frequency oscillator is stopped.
With the clock frozen, all functions are stopped, but the on-
chip RAM and Control registers are held. The port pins
output the values held by their respective port data register,
the port direction registers. The status of peripherals during
Stop mode is shown below.
Note:
Since the X
IN
pin is connected internally to GND to
avoid current leakage due to the crystal oscillator in STOP
mode, do not use STOP instruction when an external clock
is used as the main system clock.
In the Stop mode of operation, V
DD
can be reduced to min-
imize power consumption. Be careful, however, that V
DD
is not reduced before the Stop mode is invoked, and that
V
DD
is restored to its normal operating level before the
Stop mode is terminated.
The reset should not be activated before V
DD
is restored to
its normal operating level, and must be held active long
enough to allow the oscillator to restart and stabilize.
And after STOP instruction, at least two or more NOP in-
struction should be written as shown in example below.
Example:
LDM
STOP
NOP
NOP
:
CKCTLR,#0000_1110B
The Interval Timer Register CKCTLR should be initial-
ized (0F
H
or 0E
H
) by software in order that oscillation sta-
bilization time should be longer than 20ms before STOP
mode.
Figure 18-1 STOP Mode Release Timing by External Interrupt
Peripheral
STOP Mode
CPU
All CPU operations are disabled
RAM
Retain
X
IN
PIN
Low
X
OUT
PIN
High
Oscillation
Stop
I/O ports
Retain
Control Registers
Retain
Release method
by RESET, by External interrupt
Before executing Stop instruction, Basic Interval Timer must be set
properly by software to get stabilization time which is longer than 20ms.
Oscillator
(X
IN
pin)
~
n
0
BIT Counter
n+1
n+2
n+3
~
Normal Operation
Stop Operation
Normal Operation
1
FE
FF
0
1
2
~
~
~
t
>
20ms
by software
~
~
External Interrupt
Internal Clock
Clear
STOP Instruction
Executed
~
~
~
相關(guān)PDF資料
PDF描述
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參數(shù)描述
GMS81516BLQ 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS
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