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參數(shù)資料
| 型號(hào)： | MC68HC11KW1 |
| 廠(chǎng)商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| 中文描述： | 8-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | TQFP-100 |
| 文件頁(yè)數(shù)： | 106/238頁(yè) |
| 文件大小： | 798K |
| 代理商： | MC68HC11KW1 |
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MOTOROLA
5-16
MC68HC11KW1
RESETS AND INTERRUPTS
5
However, the A/D converter current can be reduced by writing the ADPU bit to zero and halting
the RC clock (CSEL cleared). If the reference voltages V
RH
, V
RL
are supplied then the interval
resistor chain still consumes current. For 5V V
RH
- V
RL
, a worst case current consumption of
260
μ
A is specified for the A/D converter. The SPI system is enabled or disabled by the SPE control
bit. The SCI transmitter is enabled or disabled by the TE bit, and the SCI receiver is enabled or
disabled by the RE bit (lowest power consumption is achieved when RE=TE=0). Power
consumption is reduced if all the PWM enable bits (PWEN[4:1]) are cleared, thereby disabling
every PWM channel. Therefore the power consumption in WAIT is dependent on the particular
application.
5.5.2
STOP
Executing the STOP instruction while the S-bit in the CCR is clear places the MCU in the STOP
condition. If the S-bit is set, the STOP opcode is treated as a no-op (NOP). The STOP condition
offers minimum power consumption because all clocks, including the crystal oscillator, are
stopped while in this mode. To exit STOP and resume normal processing, a logic low level must
be applied to one of the external interrupts (IRQ or XIRQ) or to the RESET pin. A pending
edge-triggered IRQ can also bring the CPU out of STOP.
Because all clocks are stopped in this mode, all internal peripheral functions also stop. The data
in the internal RAM is retained as long as V
DD
power is maintained. The CPU state and I/O pin
levels are static and are unchanged by STOP. Therefore, when an interrupt comes to restart the
system, the MCU resumes processing as if there were no interruption. If reset is used to restart
the system a normal reset sequence results where all I/O pins and functions are also restored to
their initial states.
To use the IRQ pin as a means of recovering from STOP, the I-bit in the CCR must be clear (IRQ
not masked). The XIRQ pin can be used to wake up the MCU from STOP regardless of the state
of the X-bit in the CCR, although the recovery sequence depends on the state of the X-bit. If X is
clear (XIRQ not masked), the MCU starts up, beginning with the stacking sequence leading to
normal service of the XIRQ request. If X is set (XIRQ masked or inhibited), then processing
continues with the instruction that immediately follows the STOP instruction, and no XIRQ
interrupt service is requested or pending.
Because the oscillator is stopped in STOP mode, a restart delay may be imposed to allow oscillator
stabilization upon leaving STOP If the internal oscillator is being used, this delay is required; however,
if a stable external oscillator is being used, the DLY control bit can be used to bypass this start-up delay.
The DLY control bit is set by reset and can be optionally cleared during initialization. If the DLY equal
to zero option is used to avoid start-up delay on recovery from STOP then reset should not be used as
the means of recovering from STOP as this causes DLY to be set again by reset, imposing the restart
delay. This same delay also applies to power-on-reset, regardless of the state of the DLY control bit,
but does not apply to a reset while the clocks are running. See Section 4.3.2.4.
TPG
104
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| MC68HC11L6CFN | HCMOS MICROCONTROLLER UNIT |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC11L0 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:CONFIG Register Programming for EEPROM-based M68HC11 Microcontrollers |
| MC68HC11L0CFN2 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC11L0CFN3 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC11L0CFU2 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC11L0CFU3 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
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