參數(shù)資料
型號(hào): MC68HC000EI10
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 147/189頁(yè)
文件大?。?/td> 0K
描述: IC MPU 16BIT 10MHZ 68-PLCC
標(biāo)準(zhǔn)包裝: 18
系列: M680x0
處理器類(lèi)型: M680x0 32-位
速度: 10MHz
電壓: 3.3V,5V
安裝類(lèi)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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5- 14
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
CLK
FC2–FC0
A19–A0
AS
DS
R/W
DTACK
D7–D0
PROCESSOR
BR
BG
S0
S6
S2 S4
S0 S2 S4 S6
S0 S2 S4 S6 S0 S2 S4 S6
DMA DEVICE
PROCESSOR
DMA DEVICE
Figure 5-16. 2-Wire Bus Arbitration Timing Diagram
The timing diagram in Figure 5-15 shows that the bus request is negated at the time that
an acknowledge is asserted. This type of operation applies to a system consisting of a
processor and one other device capable of becoming bus master. In systems having
several devices that can be bus masters, bus request lines from these devices can be
wire-ORed at the processor, and more than one bus request signal could occur.
The bus grant signal is negated a few clock cycles after the assertion of the bus grant
acknowledge signal. However, if bus requests are pending, the processor reasserts bus
grant for another request a few clock cycles after bus grant (for the previous request) is
negated. In response to this additional assertion of bus grant, external arbitration circuitry
selects the next bus master before the current bus master has completed the bus activity.
The timing diagram in Figure 5-15 also applies to a system consisting of a processor and
one other device capable of becoming bus master. Since the 48-pin version of the
MC68008 and the MC68EC000 does not recognize a bus grant acknowledge signal, this
processor does not negate bus grant until the current bus master has completed the bus
activity.
5.2.1 Requesting The Bus
External devices capable of becoming bus masters assert BR to request the bus. This
signal can be wire-ORed (not necessarily constructed from open-collector devices) from
any of the devices in the system that can become bus master. The processor, which is at
a lower bus priority level than the external devices, relinquishes the bus after it completes
the current bus cycle.
The bus grant acknowledge signal on all the processors except the 48-pin MC68008 and
MC68EC000 helps to prevent the bus arbitration circuitry from responding to noise on the
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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
MC68HC000EI10 制造商:Freescale Semiconductor 功能描述:MICROPROCESSOR IC
MC68HC000EI10R 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(lèi)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
MC68HC000EI12 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(lèi)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
MC68HC000EI16 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(lèi)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
MC68HC000EI16 制造商:Freescale Semiconductor 功能描述:Microprocessor IC