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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： | 47/78页 |
| 文件大小： | 427K |
| 代理商： | MC38HC705J2 |
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MC68HC705J2
RESETS AND INTERRUPTS
MOTOROLA
5-1
SECTION 5
RESETS AND INTERRUPTS
This section describes how resets reinitialize the MCU and how interrupts
temporarily change the normal processing sequence.
5.1 Resets
A reset immediately stops the operation of the instruction being executed. A
reset initializes certain control bits to known conditions and loads the program
counter with a user-defined reset vector address. The following conditions
produce a reset:
Initial power-up (power-on reset)
A logical zero applied to the RESET pin (external reset)
Timeout of the COP timer (COP reset)
An opcode fetch from an address not in the memory map (illegal address
reset)
A reset does the following things to reinitialize the MCU:
Clears all implemented data direction register bits so that the
corresponding I/O pins are inputs
Loads the stack pointer with $FF
Sets the interrupt mask, inhibiting interrupts
Clears the TOFE and RTIE bits in the timer control and status register
Clears the STOP latch, enabling the CPU clocks
Clears the WAIT latch, waking the CPU from the WAIT mode
Loads the program counter with the user-defined reset vector
5.1.1 Power-On Reset
A positive transition on the V
DD
pin generates a power-on reset. The power-on
reset is strictly for power-up conditions and cannot be used to detect drops in
power supply voltage.
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