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參數(shù)資料
| 型號： | GMS81C5024-XXXPL |
| 英文描述： | MICROCONTROLLER|8-BIT|CMOS|LDCC|44PIN|PLASTIC |
| 中文描述： | 單片機| 8位|的CMOS | LDCC | 44PIN |塑料 |
| 文件頁數(shù)： | 67/93頁 |
| 文件大?。?/td> | 853K |
| 代理商： | GMS81C5024-XXXPL |
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GMS81C1404/GMS81C1408
June. 2001 Ver 1.2
65
19. Power Saving Mode
For applications where power consumption is a critical
factor, device provides two kinds of power saving func-
tions, STOP mode and Wake-up Timer mode.
The power saving function is activated by execution of
STOP instruction after setting the corresponding status
(WAKEUP) of CKCTLR.
Table 19-1 shows the status of each Power Saving Mode.
19.1 Stop Mode
In the Stop mode, the on-chip oscillator is stopped. With
the clock frozen, all functions are stopped, but the on-chip
RAM and Control registers are held. The port pins out the
values held by their respective port data register, port di-
rection registers. Oscillator stops and the systems internal
operations are all held up.
The states of the RAM, registers, and latches valid
immediately before the system is put in the STOP
state are all held.
The program counter stop the address of the
instruction to be executed after the instruction
“STOP” which starts the STOP operating mode.
The Stop mode is activated by execution of STOP in-
struction after clearing the bit WAKEUP of CKCTLR
to “0”. (This register should be written by byte opera-
tion. If this register is set by bit manipulation instruc-
tion, for example “set1” or “clr1” instruction, it may be
undesired operation)
In the Stop mode of operation, V
DD
can be reduced to min-
imize power consumption. Care must be taken, however,
to ensure 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.
Note:
After STOP instruction, at least two or more NOP in-
struction should be written
Ex)
LDM
CKCTLR,#0000_1110B
STOP
NOP
NOP
In the STOP operation, the dissipation of the power asso-
ciated with the oscillator and the internal hardware is low-
ered; however, the power dissipation associated with the
pin interface (depending on the external circuitry and pro-
gram) is not directly determined by the hardware operation
of the STOP feature. This point should be little current
flows when the input level is stable at the power voltage
level (V
DD
/V
SS
); however, when the input level gets high-
er than the power voltage level (by approximately 0.3 to
0.5V), a current begins to flow. Therefore, if cutting off the
output transistor at an I/O port puts the pin signal into the
high-impedance state, a current flow across the ports input
transistor, requiring to fix the level by pull-up or other
means.
Peripheral
STOP
Wake-up Timer
RAM
Retain
Retain
Control Registers
Retain
Retain
I/O Ports
Retain
Retain
CPU
Stop
Stop
Timer0, Timer2
Stop
Operation
Oscillation
Stop
Oscillation
Prescaler
Stop
÷
2048 only
Entering Condition
[WAKEUP]
0
1
Release Sources
RESET, RCWDT, INT0~3,
EC0~1, SPI
RESET, RCWDT, INT0~3,
EC0~1, SPI, TIMER0, TIMER2
Table 19-1 Power Saving Mode
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