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Datasheet of 20-101-1194 - MODULE RABBITCORE RCM3309 ROHS
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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/O write (/IOWR) and I/O 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–PB5 and PB7 can also be used as an auxiliary
address bus.
When using the auxiliary 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
4.1.2 LEDs
The RCM3309/RCM3319 has three Ethernet status LEDs located beside the RJ-45
Ethernet jack—these are discussed in Section 4.2.
Addiitionally, there is one dual LED DS4. PD1 on the Rabbit 3000's Parallel Port D is
used to enable the serial flash, and is connected to the green
when data are being written to or read from the serial flash. The red
user-programmable LED, and is controlled by PD0. The
sample programs in the Dynamic C
use this user-programmable LED.
4.1.3 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.
User's Manual
// required to enable auxiliary I/O bus
CONTROLLED.C
SAMPLES\RCM3300
CE
LED at DS4, which blinks
BSY
LED at DS4 is a
and
FLASHLED.C
folder show how to set up and
27
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