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| 型號(hào)： | 101-0552 |
| 廠商： | Rabbit Semiconductor |
| 文件頁(yè)數(shù)： | 68/138頁(yè) |
| 文件大小： | 0K |
| 描述： | KIT DEV RABBITCORE/RCM3200 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RabbitCore 3000 |
| 類型： | MPU 模塊 |
| 適用于相關(guān)產(chǎn)品： | RCM3200 |
| 所含物品： | RabbitCore 模塊、開(kāi)發(fā)板、交流適配器、纜線和 Dynamic C? 光盤(pán) |
| 產(chǎn)品目錄頁(yè)面： | 620 (CN2011-ZH PDF) |
| 其它名稱： | 316-1023 |
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User’s Manual
29
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 auxiliary address bus.
When using the external I/O bus, you must add the following line at the beginning of your
program.
#define PORTA_AUX_IO
// required to enable external I/O bus
The STATUS output has three different programmable functions:
3. It can be driven low on the first op code fetch cycle.
4. It can be driven low during an interrupt acknowledge cycle.
5. 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
RCM3200 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 RCM3200 operates over a voltage from 3.15 V to 3.45 V, but most RCM3200 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 RCM3200. 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VI-JTM-EZ | CONVERTER MOD DC/DC 10V 25W |
| VI-JTJ-EZ | CONVERTER MOD DC/DC 36V 25W |
| REC3-4805DRWZ/H4/C | CONV DC/DC 3W 18-72VIN +/-05VOUT |
| REC3-4805DRWZ/H4/A | CONV DC/DC 3W 18-72VIN +/-05VOUT |
| REC3-243.3DRWZ/H6/C | CONV DC/DC 3W 9-36VIN +/-3.3VOUT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 10-105520-08P | 制造商:Amphenol Aerospace 功能描述:PLUG |
| 10-105520-08S | 制造商:Amphenol Aerospace 功能描述:PLUG |
| 10-105520-24P | 制造商:Amphenol Aerospace 功能描述:PLUG |
| 10-105520-24S | 制造商:Amphenol Aerospace 功能描述:PLUG |
| 101-0553 | 功能描述:KIT DEV RABBIT RCM3200 INTL RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 通用嵌入式開(kāi)發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:RabbitCore 3000 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁(yè)面:659 (CN2011-ZH PDF) |
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