参数资料
| 型号： | 20-101-1217 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 68/138页 |
| 文件大小： | 0K |
| 描述： | MODULE RABBITCORE RCM3229 |
| 标准包装： | 50 |
| 系列： | RabbitCore® |
| 模块/板类型： | MPU 核心模块 |
| 适用于相关产品： | RCM3229 |
| 产品目录页面： | 620 (CN2011-ZH PDF) |
| 其它名称： | 316-1146 |
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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.
相关PDF资料 |
PDF描述 |
|---|---|
| 20-101-0494 | MODULE RABBITCORE RCM2250 |
| AT25020N-10SI-2.7 | IC EEPROM 2KBIT 2.1MHZ 8SOIC |
| 345-030-521-801 | CARDEDGE 30POS DUAL .100 GREEN |
| 12FMN-BMTTN-A-TF | CONN FMN HSNG 12POS STAG NOR SMD |
| AT25020-10PI-2.7 | IC EEPROM 2KBIT 2.1MHZ 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 20-101-1220 | 功能描述:单板计算机 BL4S200 (RCM4310-based) RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 20-101-1221 | 功能描述:射频模块 RCM4400W Japan Telec Certfied RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| 20-101-1235 | 功能描述:模块化系统 - SOM RCM5700 Minicore RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 20-101-1236 | 功能描述:界面开发工具 INTERFACE BOARD RCM56/57XX RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| 20-101-1246 | 功能描述:模块化系统 - SOM RCM5400W RABBITCORE MODULE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
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