20-101-1138 Rabbit Semiconductor, 20-101-1138 Datasheet - Page 35

• Manufacturer Part Number: 20-101-1138
• Description: RCM4300 RABBITCORE
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1138

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Data Bus Width: 8 bit
• Core Processor: Rabbit 4000
• Clock Speed: 58.98 MHz
• Interface Type: Ethernet
• Flash: 2 MBytes
• Timers: 10 x 8 bit
• Operating Supply Voltage: 3.3 V
• Board Size: 72 mm x 47 mm x 21 mm
• For Use With/related Products: RCM4300
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1141

4.1.1 Memory I/O Interface
The Rabbit 4000 address lines (A0–A19) and all the data lines (D0–D7) are routed inter-
nally to the onboard SRAM chips. I/0 write (/IOWR) and I/0 read (/IORD) are available
for interfacing to external devices, and are also used by the RCM4300.
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 auxiliary I/O bus for any reason, you must add the following line at the
beginning of your program.
Selected pins on Parallel Ports C, D, and E as specified in Table 2 may be used for input
capture, quadrature decoder, DMA, and pulse-width modulator purposes.
4.1.2 Other Inputs and Outputs
The PE5–PE7 pins can be brought out to header J4 instead of the STATUS and the two
SMODE pins, SMODE0 and SMODE1, as explained in Appendix A.5.
/RESET_IN is normally associated with the programming port, but may be used as an
external input to reset the Rabbit 4000 microprocessor and the RCM4300 memory.
/RESET_OUT is an output from the reset circuitry that can be used to reset other
peripheral devices.
RabbitCore RCM4300 User’s Manual
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Pin
#define PORTA_AUX_IO
PD6
PD7
CONVERT
VREF
GND
Pin Name
Table 2. RCM4300 Pinout Configurations (continued)
Input/Output
Input/Output
Digital Input
Analog reference
voltage
Ground
Default Use
// required to enable auxiliary I/O bus
I/O Strobe I6
D14
PWM2
TXA/TXE
IA7
I/O Strobe I7
D15
PWM3
RXA/RXE
Input Capture
Alternate Use
Serial Port E
(RCM4310 only)
A/D converter
(RCM4300 only)
1.15 V/2.048 V/2.500 V
on-chip ref. voltage
(RCM4300 only)
Analog ground
Notes
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