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參數(shù)資料
| 型號(hào)： | MC68HC11E0VFN2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers |
| 中文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁(yè)數(shù)： | 26/268頁(yè) |
| 文件大小： | 3696K |
| 代理商： | MC68HC11E0VFN2 |
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General Description
Data Sheet
M68HC11E Family — Rev. 5
26
General Description
MOTOROLA
1.4.6 Non-Maskable Interrupt (XIRQ/V
PPE
)
The XIRQ input provides a means of requesting a non-maskable interrupt after
reset initialization. During reset, the X bit in the condition code register (CCR) is set
and any interrupt is masked until MCU software enables it. Because the XIRQ input
is level-sensitive, it can be connected to a multiple-source wired-OR network with
an external pullup resistor to V
DD
. XIRQ is often used as a power loss detect
interrupt.
Whenever XIRQ or IRQ is used with multiple interrupt sources each source must
drive the interrupt input with an open-drain type of driver to avoid contention
between outputs.
NOTE:
IRQ must be configured for level-sensitive operation if there is more than one
source of
IRQ interrupt.
There should be a single pullup resistor near the MCU interrupt input pin (typically
4.7 k
). There must also be an interlock mechanism at each interrupt source so
that the source holds the interrupt line low until the MCU recognizes and
acknowledges the interrupt request. If one or more interrupt sources are still
pending after the MCU services a request, the interrupt line will still be held low and
the MCU will be interrupted again as soon as the interrupt mask bit in the MCU is
cleared (normally upon return from an interrupt). Refer to
Section 5. Resets and
Interrupts
.
V
PPE
is the input for the 12-volt nominal programming voltage required for
EPROM/OTPROM programming. On devices without EPROM/OTPROM, this pin
is only an XIRQ input.
CAUTION:
During EPROM programming of the MC68HC711E9 device, the V
PPE
pin circuitry
may latch-up and be damaged if the input current is not limited to 10 mA. For more
information please refer to MC68HC711E9 8-Bit Microcontroller Unit Mask Set
Errata 3 (Motorola document order number 68HC711E9MSE3.
1.4.7 MODA and MODB (MODA/LIR and MODB/V
STBY
)
During reset, MODA and MODB select one of the four operating modes:
Single-chip mode
Expanded mode
Test mode
Bootstrap mode
Refer to
Section 2. Operating Modes and On-Chip Memory
.
After the operating mode has been selected, the load instruction register (LIR) pin
provides an open-drain output to indicate that execution of an instruction has
begun. A series of E-clock cycles occurs during execution of each instruction. The
LIR signal goes low during the first E-clock cycle of each instruction (opcode fetch).
This output is provided for assistance in program debugging.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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