- 您现在的位置：买卖IC网 > PDF目录69027 > MC68HC05SR3FB (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44 PDF资料下载
参数资料
| 型号： | MC68HC05SR3FB |
| 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 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 31/96页 |
| 文件大小： | 3143K |
| 代理商： | MC68HC05SR3FB |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页当前第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页
MC68HC05SR3
Freescale
5-1
RESETS AND INTERRUPTS
5
RESETS AND INTERRUPTS
This section describes the reset and interrupt functions on the MCU.
5.1
RESETS
The MC68HC05SR3 can be reset in three ways:
by initial power-on reset function, (POR),
by an active low input to the RESET pin, (RESET), and
by a Low Voltage Reset, (LVR).
All of these resets will cause the program to go to the starting address, specified by the contents
of memory locations $1FFE and $1FFF, and cause the interrupt mask (I-bit) of the Condition Code
Register (CCR) to be set.
5.1.1
Power-On Reset (POR)
The power-on reset (POR) occurs on power-up to allow the clock oscillator to stabilize. The POR
is strictly for power-up conditions, and should not be used to detect any drops in power supply
voltage.
There is an oscillator stabilization delay of tPORL internal processor bus clock cycles after the
oscillator becomes active. The RESET pin will be pulled down internally during these cycles. If the
RESET pin is low (by external circuit) at the end of the tPORL period, the processor remains in the
reset condition until RESET goes high.
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 is connected to a Schmitt Trigger circuit as part of its input to improve noise immunity.
TPG
35
05SR3.Book Page 1 Thursday, August 4, 2005 1:08 PM
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC05SR3CFB | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC05T7B | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| MC68HC05V12CFNR2 | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| MC68HC08AS20FNR2 | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
| MC68HC08AS20VFNR2 | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC05SU3A | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Fully static chip design featuring the industry standard 8-bit M68HC05 core |
| MC68HC05T16 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit |
| MC68HC05V12 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontreller Unit |
| MC68HC05V12CFN | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05X16 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
发布紧急采购，3分钟左右您将得到回复。