- 您现在的位置：买卖IC网 > PDF目录69027 > MC68HC08AS20CFN (MOTOROLA INC) 8-BIT, MROM, MICROCONTROLLER, PQCC52 PDF资料下载
参数资料
| 型号： | MC68HC08AS20CFN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 32/96页 |
| 文件大小： | 3243K |
| 代理商： | MC68HC08AS20CFN |
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页第31页当前第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
4
MOTOROLA
4-2
MC68HC05E0
RESETS, INTERRUPTS AND LOW POWER MODES
4.1.1
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 for a 4064 tCYC delay from the time that the
oscillator becomes active. If the external RESET pin is low at the end of the 4064 cycle time-out,
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 the 4064
cycles have elapsed. If there is doubt, the external RESET pin should remain low until the voltage
on VDD has reached the specied minimum operating voltage.
4.1.2
RESET Pin
When the oscillator is running in a stable state, the MCU is reset when a logic zero is applied to
the RESET input for a minimum period of one and one-half machine cycles (tCYC). This pin
contains an internal Schmitt Trigger as part of its input to improve noise immunity.
4.2
Interrupts
The MCU can be interrupted by seven different sources: six maskable hardware interrupts and
one non-maskable software interrupt:
External signal on the INTX pin,
Real Time Interrupt,
Port C Wake-up,
Timer A,
Timer B,
Serial Interface,
Software Interrupt instruction (SWI).
Interrupts cause the processor to save the register contents on the stack and to set the interrupt
mask (I bit) to prevent additional interrupts. The RTI instruction (ReTurn from Interrupt) causes the
register contents to be recovered from the stack and normal processing to resume.
Unlike reset, hardware interrupts do not cause the current instruction execution to be halted, but
are considered pending until the current instruction is complete.
Note:
The current instruction is the one already fetched and being operated on.
38
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC08AZ48AVFU | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC08AZ60FU | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC08AZ60FU | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC08AZ60MFU | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC08AZ60VFU | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC08AZ0 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Advance Information |
| MC68HC08AZ0CFU | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Advance Information |
| MC68HC08AZ16 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC08AZ24 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC08AZ32 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Advance Information |
发布紧急采购，3分钟左右您将得到回复。