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| 型號(hào)： | MC68HC000IEI16 |
| 廠商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 119/189頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU 32BIT 68-PLCC |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 系列： | M680x0 |
| 處理器類型： | M680x0 32-位 |
| 速度： | 16MHz |
| 電壓： | 3.3V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 68-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 68-PLCC（25x25） |
| 包裝： | 管件 |
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MOTOROLA
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
3- 7
3.6 SYSTEM CONTROL
The system control inputs are used to reset the processor, to halt the processor, and to
signal a bus error to the processor. The outputs reset the external devices in the system
and signal a processor error halt to those devices. The three system control signals are
described in the following paragraphs.
Bus Error (
BERR)
This input signal indicates a problem in the current bus cycle. The problem may be the
following:
1. No response from a device.
2. No interrupt vector number returned.
3. An illegal access request rejected by a memory management unit.
4. Some other application-dependent error.
Either the processor retries the bus cycle or performs exception processing, as
determined by interaction between the bus error signal and the halt signal.
Reset (
RESET)
The external assertion of this bidirectional signal along with the assertion of HALT starts
a system initialization sequence by resetting the processor. The processor assertion of
RESET (from executing a RESET instruction) resets all external devices of a system
without affecting the internal state of the processor. To reset both the processor and the
external devices, the RESET and HALT input signals must be asserted at the same
time.
Halt (
HALT)
An input to this bidirectional signal causes the processor to stop bus activity at the
completion of the current bus cycle. This operation places all control signals in the
inactive state and places all three-state lines in the high-impedance state (refer to Table
3-4).
When the processor has stopped executing instructions (in the case of a double bus
fault condition, for example), the HALT line is driven by the processor to indicate the
condition to external devices.
Mode (MODE) (MC68HC001/68EC000)
The MODE input selects between the 8-bit and 16-bit operating modes. If this input is
grounded at reset, the processor will come out of reset in the 8-bit mode. If this input is
tied high or floating at reset, the processor will come out of reset in the 16-bit mode.
This input should be changed only at reset and must be stable two clocks after RESET
is negated. Changing this input during normal operation may produce unpredictable
results.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MC68HC000IEI16R | 功能描述:微處理器 - MPU 16-BIT MPU RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| MC68HC000IFN16R2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HC000P10 | 制造商:Motorola Inc 功能描述: |
| MC68HC000P12 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Addendum to M68000 User Manual |
| MC68HC000P16 | 制造商:Motorola Inc 功能描述: |
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