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參數(shù)資料
| 型號： | MC908QL2C |
| 廠商： | Motorola, Inc. |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 137/222頁 |
| 文件大小： | 2861K |
| 代理商： | MC908QL2C |
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Modes of Operation
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
Freescale Semiconductor
137
LVR, POR, COP watchdog, RST pin, etc.) is asserted. SLIC reset mode may also be entered by the user
software by asserting the INITREQ bit. INITACK indicates whether the SLIC module is in the reset mode
as a result of writing INITREQ in SLCC1. While in the reset state the SLIC module clocks are stopped.
Clearing the INITREQ allows the SLIC to proceed and enter SLIC run mode (if SLCE is set). The module
will clear INITACK after the module has left reset mode and the SLIC will seek the next LIN header. It is
the responsibility of the user to verify that this operation is compatible with the application before
implementing this feature.
In this mode, the internal SLIC module voltage references are operative, V
DD
is supplied to the internal
circuits, which are held in their reset state and the internal SLIC module system clock is running. Registers
will assume their reset condition. Outputs are held in their programmed reset state, inputs and network
activity are ignored.
14.5.3 SLIC Disabled
This mode is entered from the reset mode after all MCU reset sources are no longer asserted or INITREQ
is cleared by the user and the SLIC module clears INITACK. It is entered from the run mode whenever
SLCE in SLCC2 is cleared. In this mode the SLIC clock is stopped to conserve power and allow the SLIC
module to be configured for proper operation on the LIN bus.
14.5.4 SLIC Run
This mode is entered from the SLIC disabled mode when SLCE in SLCC2 is set. It is entered from the
SLIC wait mode whenever activity is sensed on the LIN bus or some other MCU source wakes the CPU
out of wait mode.
It is entered from the SLIC stop mode whenever network activity is sensed or some other MCU source
wakes the CPU out of stop mode. Messages will not be received properly until the clocks have stabilized
and the CPU is also in the run mode.
14.5.5 SLIC Wait
This power conserving mode is automatically entered from the run mode whenever the CPU executes a
WAIT instruction and SLCWCM in SLCC1 is previously cleared. In this mode, the SLIC module internal
clocks continue to run. Any activity on the LIN network will cause the SLIC module to exit SLIC wait mode
and return to SLIC run.
14.5.6 Wakeup from SLIC Wait with CPU in WAIT
If the CPU executes the WAIT instruction and the SLIC module enters the wait mode (SLCWCM = 0), the
clocks to the SLIC module as well as the clocks in the MCU continue to run. Therefore, the message that
wakes up the SLIC module from WAIT and the CPU from wait mode will also be received correctly by the
SLIC module. This is because all of the required clocks continue to run in the SLIC module in wait mode.
14.5.7 SLIC Stop
This power conserving mode is automatically entered from the run mode whenever the CPU executes a
STOP instruction, or if the CPU executes a WAIT instruction and SLCWCM in SLCC1 is previously set.
In this mode, the SLIC internal clocks are stopped. Any activity on the network will cause the SLIC module
to exit SLIC stop mode and generate an unmaskable interrupt of the CPU. This wakeup interrupt state is
reflected in the SLCSV, encoded as the highest priority interrupt. This interrupt can be cleared by the CPU
with a read of the SLCSV and clearing of the SLCF interrupt flag. Depending upon which low-power mode
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC908QL2M | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
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