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參數(shù)資料
| 型號(hào)： | C508 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁(yè)數(shù)： | 58/93頁(yè) |
| 文件大小： | 1204K |
| 代理商： | C508 |
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C508
Data Sheet
54
2000-08
Power Saving Modes
The C508 provides two basic power saving modes, the idle mode and the power down
mode. Additionally, a slow down mode is available. This power saving mode reduces the
internal clock rate in normal operating mode and it can also be used for further power
reduction in idle mode.
Idle Mode
In the idle mode, the oscillator of the C508 continues to run, but the CPU is gated off
from the clock signal. However, the interrupt system, the serial port, the A/D converter,
the capture/compare unit, and all timers (with the exception of the Watchdog Timer)
are further provided with the clock. The CPU status is preserved in its entirety: the
stack pointer, program counter, program status word, accumulator, and all other
registers maintain their data during idle mode.
Slow Down Mode
In some applications, where power consumption and dissipation are critical, the
controller might run for a certain time at reduced speed (for example, if the controller
is waiting for an input signal). Since in CMOS devices, there is an almost linear
dependence of the operating frequency and the power supply current, so, a reduction
of the operating frequency results in reduced power consumption.
Software Power Down Mode
In the software power down mode, the RC oscillator, the on-chip oscillator which
operates with the XTAL pins and the PLL are all stopped. Therefore, all functions of
the microcontroller are stopped and only the contents of the on-chip RAM, XRAM and
the SFR's are maintained. The port pins, which are controlled by their port latches,
output the values that are held by their SFR's. The port pins which serve the alternate
output functions show the values they had at the end of the last cycle of the instruction
which initiated the power down mode. ALE and PSEN are held at logic low level. This
power down mode is entered by software and can be left by reset.
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