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| 型號(hào)： | MC908QL2DW |
| 廠商： | Motorola, Inc. |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁(yè)數(shù)： | 58/222頁(yè) |
| 文件大?。?/td> | 2861K |
| 代理商： | MC908QL2DW |
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Auto Wakeup Module (AWU)
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
58
Freescale Semiconductor
4.3 Functional Description
The function of the auto wakeup logic is to generate periodic wakeup requests to bring the microcontroller
unit (MCU) out of stop mode. The wakeup requests are treated as regular keyboard interrupt requests,
with the difference that instead of a pin, the interrupt signal is generated by an internal logic.
Writing the AWUIE bit in the keyboard interrupt enable register enables or disables the auto wakeup
interrupt input (see
Figure 4-1
). A 1 applied to the AWUIREQ input with auto wakeup interrupt request
enabled, latches an auto wakeup interrupt request.
There exists two clock sources for the AWU. An internal RC oscillator (exclusive for the auto wakeup
feature, AWU oscillator) drives the wakeup request generator provided the OSCENINSTOP bit in the
CONFIG2 register
Figure 4-1
is cleared. If the application employs a crystal, for example, by setting the
OSCENINSTOP bit the BUSCLKX4 will drive the wakeup request generator to allow a more accurate
wakeup.
Entering stop mode will enable the auto wakeup generation logic.
Once the overflow count is reached in the generator counter, a wakeup request, AWUIREQ, is latched
and sent to the KBI logic. See
Figure 4-1
.
Wakeup interrupt requests will only be serviced if the associated interrupt enable bit, AWUIE, in KBIER
is set. The AWU shares the keyboard interrupt vector.
The overflow count can be selected from two options defined by the COPRS bit in CONFIG1. This bit was
“borrowed” from the computer operating properly (COP) using the fact that the COP feature is idle (no
MCU clock available) in stop mode.
The auto wakeup RC oscillator is highly dependent on operating voltage and temperature. This feature is
not recommended for use as a time-keeping function.
The wakeup request is latched to allow the interrupt source identification. The latched value, AWUL, can
be read directly from the bit 6 position of PTA data register. This is a read-only bit which is occupying an
empty bit position on PTA. No PTA associated registers, such as PTA6 data, PTA6 direction, and PTA6
pullup/down exist for this bit. The latch can be cleared by writing to the ACKK bit in the KBSCR register.
Reset also clears the latch. AWUIE bit in KBI interrupt enable register (see
Figure 4-1
) has no effect on
AWUL reading.
The AWU oscillator and counters are inactive in normal operating mode and become active only upon
entering stop mode.
4.4 Interrupts
The AWU can generate an interrupt requests:.
AWU Latch (AWUL) — The AWUL bit is set when the AWU counter overflows. The auto wakeup interrupt
mask bit, AWUIE, is used to enable or disable AWU interrupt requests.
The AWU shares its interrupt with the KBI vector.
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| MC908QL2M | Microcontrollers |
| MC908QL2V | Microcontrollers |
| MC908QL4DT | Microcontrollers |
| MC908QL4DW | Microcontrollers |
| MC908QL4M | Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC908QL2M | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL2V | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL3C | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL3CDWE | 功能描述:8位微控制器 -MCU NITRON LIN RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC908QL3DT | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
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