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| 型號(hào)： | 101-0517 |
| 廠商： | Rabbit Semiconductor |
| 文件頁(yè)數(shù)： | 33/110頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | MODULE RABBITCORE RCM3100 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RabbitCore® |
| 模塊/板類型： | MPU 核心模塊 |
| 適用于相關(guān)產(chǎn)品： | RCM3100 |
| 其它名稱： | 316-1021 |
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User’s Manual
23
4.1.1 Memory I/O Interface
The Rabbit 3000 address lines (A0–A19) and all the data lines (D0–D7) are routed inter-
nally to the onboard flash memory and SRAM chips. I/0 write (/IOWR) and I/0 read
(/IORD) are available for interfacing to external devices.
Parallel Port A can also be used as an external I/O data bus to isolate external I/O from the
main data bus. Parallel Port B pins PB2–PB7 can also be used as an external address bus.
When using the auxiliary I/O bus instead of the default address bus, you must add the fol-
lowing line at the beginning of your program.
#define PORTA_AUX_IO
// required to enable auxiliary I/O bus
The STATUS output has three different programmable functions:
5. It can be driven low on the first op code fetch cycle.
6. It can be driven low during an interrupt acknowledge cycle.
7. It can also serve as a general-purpose output.
4.1.2 Other Inputs and Outputs
Two status mode pins, SMODE0 and SMODE1, are available as inputs. The logic state of
these two pins determines the startup procedure after a reset.
/RESET_IN is an external input used to reset the Rabbit 3000 microprocessor and the
RabbitCore RCM3100 memory. /RES is an output from the reset circuitry that can be used
to reset other peripheral devices.
4.1.3 5 V Tolerant Inputs
The RCM3100 operates over a voltage from 3.15 V to 3.45 V, but most RCM3100 input
pins, except /RESET_IN, VRAM, VBAT_EXT, and the power-supply pins, are 5 V toler-
ant. When a 5 V signal is applied to 5 V tolerant pins, they present a high impedance even if
the Rabbit power is off. The 5 V tolerant feature allows 5 V devices that have a suitable
switching threshold to be connected directly to the RCM3100. This includes HCT family
parts operated at 5 V that have an input threshold between 0.8 and 2 V.
NOTE: CMOS devices operated at 5 V that have a threshold at 2.5 V are not suitable for
direct connection because the Rabbit 3000 outputs do not rise above VDD, and is often
specified as 3.3 V. Although a CMOS input with a 2.5 V threshold may switch at 3.3 V,
it will consume excessive current and switch slowly.
In order to translate between 5 V and 3.3 V, HCT family parts powered from 5 V can be
used, and are often the best solution. There is also the “LVT” family of parts that operate
from 2.0 V to 3.3 V, but that have 5 V tolerant inputs and are available from many suppli-
ers. True level-translating parts are available with separate 3.3 V and 5 V supply pins, but
these parts are not usually needed, and have design traps involving power sequencing.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 101-0518 | 功能描述:模塊化系統(tǒng) - SOM RCM3110 RABBITCORE RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 101052 | 制造商:RUKO 功能描述:Bulk 制造商:RUKO 功能描述:STEP DRILL 4-30MMX2MM 制造商:RUKO 功能描述:STEP DRILL, 4-30MMX2MM 制造商:RUKO 功能描述:STEP DRILL, 4-30MMX2MM; Drill Bit Size Metric:4mm; Overall Length:100mm; Drill Bit Type:Step; Drill Point Diameter:4mm; Material:HSS; Range:4mm - 30mm; Shank Dia:9mm; Step:2mm ;RoHS Compliant: NA 制造商:RUKO 功能描述:STEP DRILL, 4-30MMX2MM; Drill Bit Size Metric:4mm; Overall Length:100mm; SVHC:No SVHC (19-Dec-2012); Drill Bit Type:Step; Drill Point Diameter:4mm; Material:HSS; Range:4mm - 30mm; Shank Dia:9mm; Step:2mm ;RoHS Compliant: NA |
| 101-0520 | 功能描述:模塊化系統(tǒng) - SOM RCM3200 44.2MHz CPU 512K FLASH RJ45 RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 10-105-2-05 | 制造商:Concord Electronics Inc 功能描述: |
| 10-105208-02P | 制造商:Amphenol Aerospace 功能描述:RECEPT |
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