参数资料
型号: XC68HC705X4DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 112/168页
文件大小: 656K
代理商: XC68HC705X4DW
Resets, Interrupts and Low Power Modes
MC68HC05X4
48
Resets, Interrupts and Low Power Modes
MOTOROLA
Power-on reset
A power-on reset occurs when a positive transition is detected on VDD.
The power-on reset function is strictly for power turn-on conditions and
should not be used to detect drops in the power supply voltage. The
power-on circuitry provides a stabilisation delay (t
PORL) from when the
oscillator becomes active. If the external RESET pin is low at the end of
this delay then the processor remains in the reset state until RESET
goes high. The user must ensure that the voltage on VDD has risen to a
point where the MCU can operate properly by the time t
PORL has elapsed.
If there is doubt, the external RESET pin should remain low until the
voltage on VDD has reached the specified minimum operating voltage.
This may be accomplished by connecting an external RC-circuit to this
pin to generate a power-on reset (POR). In this case, the time constant
must be great enough (at least 100 ms) to allow the oscillator circuit to
stabilise.
Figure 1. Power-on reset and RESET
VDD
RESET
1FFF
1FFE
New
7FFF
7FFE
PC
OSC1
New
PC
Internal
processor clock
7FFE
Op
code
New
PCL
New
PCH
tVDDR
Op
code
New
PCL
New
PCH
address bus
Internal
data bus
tOXOV
tCYC
tPORL
1FFE
Program
execution
begins
Program
execution
begins
tRL(or tDOGL)
(Internal power-on reset)
(External hardware reset)
VDD threshold (1-2V typical)
Reset sequence
2-resets
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