20-101-1028 Rabbit Semiconductor, 20-101-1028 Datasheet - Page 32
20-101-1028
Manufacturer Part Number
20-101-1028
Description
MODULE RABBITCORE RCM3750
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-101-1028.pdf
(172 pages)
Specifications of 20-101-1028
Module/board Type
MPU Core Module
Product
Microcontroller Modules
Core Processor
Rabbit 3000
Flash
512 KBytes
Operating Supply Voltage
4.75 to 5.25 V
Board Size
75 mm x 30 mm x 23 mm
For Use With/related Products
RCM3750
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
316-1110
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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 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–PB5 and PB7 can also be used as an auxiliary
address bus.
When using the auxiliary I/O bus for either Ethernet 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 auxiliary 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 other peripheral devices.
This pin can also be used to reset the microprocessor.
26
RabbitCore RCM3750
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