参数资料
| 型号： | MC68HC000EI8 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 187/189页 |
| 文件大小： | 0K |
| 描述： | IC MPU 16BIT 8MHZ 68-PLCC |
| 标准包装： | 18 |
| 系列： | M680x0 |
| 处理器类型： | M680x0 32-位 |
| 速度： | 8MHz |
| 电压： | 3.3V，5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 68-LCC（J 形引线） |
| 供应商设备封装： | 68-PLCC（25x25） |
| 包装： | 管件 |
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6- 12
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
interrupt priority mask is set at level 7. In the MC68010, the VBR is forced to zero. The
vector number is internally generated to reference the reset exception vector at location 0
in the supervisor program space. Because no assumptions can be made about the validity
of register contents, in particular the SSP, neither the program counter nor the status
register is saved. The address in the first two words of the reset exception vector is
fetched as the initial SSP, and the address in the last two words of the reset exception
vector is fetched as the initial program counter. Finally, instruction execution is started at
the address in the program counter. The initial program counter should point to the power-
up/restart code.
The RESET instruction does not cause a reset exception; it asserts the RESET signal to
reset external devices, which allows the software to reset the system to a known state and
continue processing with the next instruction.
6.3.2 Interrupts
Seven levels of interrupt priorities are provided, numbered from 1–7. All seven levels are
available except for the 48-pin version for the MC68008.
NOTE
The MC68008 48-pin version supports only three interrupt
levels: 2, 5, and 7. Level 7 has the highest priority.
Devices can be chained externally within interrupt priority levels, allowing an unlimited
number of peripheral devices to interrupt the processor. The status register contains a 3-
bit mask indicating the current interrupt priority, and interrupts are inhibited for all priority
levels less than or equal to the current priority.
An interrupt request is made to the processor by encoding the interrupt request levels 1–7
on the three interrupt request lines; all lines negated indicates no interrupt request.
Interrupt requests arriving at the processor do not force immediate exception processing,
but the requests are made pending. Pending interrupts are detected between instruction
executions. If the priority of the pending interrupt is lower than or equal to the current
processor priority, execution continues with the next instruction, and the interrupt
exception processing is postponed until the priority of the pending interrupt becomes
greater than the current processor priority.
If the priority of the pending interrupt is greater than the current processor priority, the
exception processing sequence is started. A copy of the status register is saved; the
privilege mode is set to supervisor mode; tracing is suppressed; and the processor priority
level is set to the level of the interrupt being acknowledged. The processor fetches the
vector number from the interrupting device by executing an interrupt acknowledge cycle,
which displays the level number of the interrupt being acknowledged on the address bus.
If external logic requests an automatic vector, the processor internally generates a vector
number corresponding to the interrupt level number. If external logic indicates a bus error,
the interrupt is considered spurious, and the generated vector number references the
spurious interrupt vector. The processor then proceeds with the usual exception
processing, saving the format/offset word (MC68010 only), program counter, and status
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For More Information On This Product,
Go to: www.freescale.com
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| MC68HC000EI8 | 制造商:Freescale Semiconductor 功能描述:Microprocessor IC |
| MC68HC000EI8R2 | 功能描述:微处理器 - MPU 16-BIT MPU RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MC68HC000FN10 | 制造商:Freescale Semiconductor 功能描述:Microprocessor IC Processor Type:68xxx 3 |
| MC68HC000FN12 | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC000FN16 | 功能描述:IC MPU 32BIT 16MHZ 68-PLCC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M680x0 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA（25x25） 包装:托盘 |
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