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| 型号： | MC38HC705J2 |
| 厂商： | Motorola, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | RTS Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 3.3V; Power: 2W; Assembly; High Power Density; Optional Continuous Short Circuit Protected; Efficiency to 85% |
| 中文描述： | M68HC05系列系列8位微控制器单元 |
| 文件页数： | 45/78页 |
| 文件大小： | 427K |
| 代理商： | MC38HC705J2 |
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MC68HC705J2
CENTRAL PROCESSOR UNIT
MOTOROLA
4-25
4.5.2 WAIT Mode
The WAIT instruction puts the MCU in an intermediate power-consumption
mode. In WAIT mode, the following events occur:
All CPU clocks stop.
The CPU clears the interrupt mask in the condition code register,
enabling external interrupts and timer interrupts.
The WAIT instruction does not affect any other registers or any I/O lines. The
timer and COP timer remain active in WAIT mode.
The following conditions bring the MCU out of WAIT mode:
A timer interrupt. If a real-time interrupt or a timer overflow interrupt
occurs during WAIT mode, the MCU loads the program counter with the
contents of locations $0FF8 and $0FF9, the locations of the vector
address of the timer interrupt service routine.
An external interrupt. An external interrupt automatically loads the
program counter with the contents of locations $0FFA and $0FFB, the
locations of the vector address of the external interrupt service routine.
A COP timer reset. A timeout of the COP timer during WAIT mode resets
the MCU. The programmer can enable real-time interrupts so the MCU
can periodically exit WAIT mode to reset the COP timer.
A reset signal on the RESET pin during WAIT mode resets the MCU.
A COP timer reset or a reset signal on the RESET pin automatically loads the
program counter with the contents of locations $0FFE and $0FFF, the locations
of the vector address of the reset service routine.
Figure 4-3 shows the sequence of events caused by the WAIT instruction.
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