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參數(shù)資料
| 型號(hào)： | SAB83C517A-N18-T4 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁(yè)數(shù)： | 16/137頁(yè) |
| 文件大?。?/td> | 2089K |
| 代理商： | SAB83C517A-N18-T4 |
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Device Specification
Semiconductor Group
7-50
Requirements for Hardware Power Down Mode
There is no dedicated pin to enable the Hardware Power Down Mode. Nevertheless for a
correct function of the Hardware Power Down Mode the oscillator watchdog unit including its
internal RC oscillator is needed. Therefore this unit must be enabled by pin OWE (OWE =
high). However, the control pin PE/SWD has no control function in this mode. It enables and
disables only the use of software controlled power saving modes.
Software controlled power saving modes
All of these modes are entered by software. Special function register PCON (power control
register, address is 87H) is used to select one of these modes.
Slow Down Mode
During slow down operation all signal frequencies that are derived from the oscillator clock, are
divided by eight, also the clockout signal and the watchdog timer count.
The slow down mode is enabled by setting bit SD. The controller actually enters the slow down
mode after a short synchronisation period (max. 2 machine cycles).
The slow down mode is disabled by clearing bit SD.
Idle Mode
During idle mode all peripherals of the SAB 80C517A (except for the watchdog timer) are still
supplied by the oscillator clock. Thus the user has to take care which peripheral should
continue to run and which has to be stopped during Idle.
The procedure to enter the idle mode is similar to the one entering the power down mode. The
two bits IDLE and IDLS must be set by two consecutive instructions to minimize the chance of
unintentional activating of the idle mode.
There are two ways to terminate the idle mode:
– The idle mode can be terminated by activating any enabled interrupt. This interrupt will
be serviced and the instruction to be executed following the RETI instruction will be the
one following the instruction that set the bit IDLS.
–
The other way to terminate the idle mode, is a hardware reset. Since the oscillator is
still running, the hardware reset must be held active only for two machine cycles for
a complete reset.
Normally the port pins hold the logical state they had at the time idle mode was activated. If
some pins are programmed to serve their alternate functions they still continue to output during
idle mode if the assigned function is on. The control signals ALE and hold at logic high levels
PSEN (see table 8).
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