參數(shù)資料
型號(hào): 101-1055
廠商: Rabbit Semiconductor
文件頁數(shù): 98/164頁
文件大?。?/td> 0K
描述: MODULE RABBIT CORE RCM3375
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: RCM3375
User’s Manual
33
4.1.1 Memory I/O Interface
The Rabbit 3000 address lines (A0–A18) and all the data lines (D0–D7) are routed
internally to the onboard flash memory and SRAM chips. I/0 write (/IOWR) and I/0 read
(/IORD) are available for interfacing to external devices—pay attention to the loading on
these two signals if you use them since these signals are also used by the RCM3365/
RCM3375.
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 for a digital output or the LCD/keypad module on the
Prototyping Board, or for any other reason, you must add the following line at the begin-
ning of your program.
#define PORTA_AUX_IO
// required to enable external I/O bus
4.1.2 Other Inputs and Outputs
The status, /RESET_IN, SMODE0, and SMODE1 I/O are normally associated with the
programming port. Since the status pin is not used by the system once a program has been
downloaded and is running, the status pin can then be used as a general-purpose CMOS
output. The programming port is described in more detail in Section 4.2.3.
/RES is an output from the reset circuitry that can be used to reset external peripheral
devices.
4.1.3 LEDs
The RCM3365/RCM3375 has five status LEDs located beside the RJ-45 Ethernet jack:
ACT
, LINK, SPEED, FM, and USR.
The yellow ACT LED at DS1 indicates network activity.
The green LINK LED at DS2 indicates that the RCM3365/RCM3375 is connected to a
working network.
The green SPEED LED at DS4 is on to indicate when the RCM3365/RCM3375 is con-
nected to a 100Base-T Ethernet connection.
The FM LED at DS3 blinks when data are being written to or read from the flash mass-
storage device.
The red USR LED at DS3 is a user-programmable LED, which is controlled by PD0 on
the Rabbit 3000’s Parallel Port D. The sample program FLASHLED.C provided in the
Dynamic C SAMPLES\RCM3360 folder shows how to set up and use this user-
programmable LED.
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