参数资料
型号: MC68HC05BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 59/128页
文件大小: 9691K
代理商: MC68HC05BS8FB
5-2
MC68HC05BS8
RESETS AND INTERRUPTS
5
5.1.2
RESET Pin
The RESET input pin is used to reset the MCU to provide an orderly software start-up procedure.
When using the external reset, the RESET pin must stay low for a minimum of 1.5tCYC. The
RESET pin contains an internal Schmitt Trigger as part of its input to improve noise immunity.
5.1.3
Low Voltage Reset (LVR)
When the LVR function is enabled, an internal reset is generated if VDD drops below VLVR. (See
Section 13 for value of VLVR.)
This LVR reset function is enabled/disabled by programming or erasing bit 0 in the EEPROM
Options register ($0200). Refer to Section 4.5.2.
Figure 5-1 Power-On Reset and RESET Timing
VDD
OSC2 PIN1
INTERNAL
CLOCK2
INTERNAL
ADDRESS
BUS2
INTERNAL
DATA
BUS2
RESET
3FFE
3FFF
NEW PC
3FFE
3FFF
tVDDR
VDD THRESHOLD (TYPICALLY 1-2V)
4064 tCYC
tOXOV
tCYC
3
NEW
PCH
NEW
PCL
OP
CODE
tRL=1.5tCYC
PCH
PCL
OP
CODE
NEW PC
NOTES:
1. OSC2 is not meant to represent frequency. It is only used to represent time.
2. Internal clock, internal address bus, and internal data bus signals are not available externally.
3. Next rising edge of internal clock after rising edge of RESET initiates reset sequence.
TPG
34
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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