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HCS08 bảng dữ liệu(PDF) 29 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  HCS08 Microcontrollers
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HCS08 bảng dữ liệu(HTML) 29 Page - NXP Semiconductors

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Chapter 3 Modes of Operation
MC9S08QD4 Series MCU Data Sheet, Rev. 6
Freescale Semiconductor
29
3.6.4
LVD Enabled in Stop Mode
The LVD system is capable of generating either an interrupt or a reset when the supply voltage drops below
the LVD voltage. If the LVD is enabled in stop by setting the LVDE and the LVDSE bits, then the voltage
regulator remains active during stop mode. If the user attempts to enter stop2 with the LVD enabled for
stop, the MCU will instead enter stop3. Table 3-3 summarizes the behavior of the MCU in stop when the
LVD is enabled.
3.6.5
On-Chip Peripheral Modules in Stop Modes
When the MCU enters any stop mode, system clocks to the internal peripheral modules are stopped. Even
in the exception case (ENBDM = 1), where clocks to the background debug logic continue to operate,
clocks to the peripheral systems are halted to reduce power consumption. Refer to Section 3.6.1, “Stop2
Mode,” and Section 3.6.2, “Stop3 Mode,” for specific information on system behavior in stop modes.
Table 3-2. BDM Enabled Stop Mode Behavior
Mode
PPDC
CPU, Digital
Peripherals,
Flash
RAM
ICS
ADC1
Regulator
I/O Pins
RTI
Stop3
0
Standby
Standby
Active
Optionally on
Active
States held
Optionally on
Table 3-3. LVD Enabled Stop Mode Behavior
Mode
PPDC
CPU, Digital
Peripherals,
Flash
RAM
ICS
ADC1
Regulator
I/O Pins
RTI
Stop3
0
Standby
Standby
Off1
1 ICS can be configured to run in stop3. Please see the ICS registers.
Optionally on
Active
States held
Optionally on
Table 3-4. Stop Mode Behavior
Peripheral
Mode
Stop2
Stop3
CPU
Off
Standby
RAM
Standby
Standby
Flash
Off
Standby
Parallel Port Registers
Off
Standby
ADC1
Off
Optionally On1
1 Requires the asynchronous ADC clock and LVD to be enabled, else in standby.
ICS
Off
Standby
TPM1 & TPM2
Off
Standby
Voltage Regulator
Standby
Standby
I/O Pins
States Held
States Held



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