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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 flash memory and SRAM chips. I/0 write (/IOWR) and I/0 read
(/IORD) are available for interfacing to external devices, and are also used by the
RCM4510W.
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 any reason, you must add the following line at the
beginning of your program.
#define PORTA_AUX_IO
// required to enable external I/O bus
Selected pins on Parallel Ports 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 STATUS and the two SMODE pins, SMODE0 and SMODE1, can be brought out to
header J1 instead of the PE5–PE7 pins as explained in Appendix A.6.
/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 RCM4510W memory.
/RESET_OUT is an output from the reset circuitry that can be used to reset other
peripheral devices.
4.1.3 Auxiliary I/O
Up to nine additional digital I/O, up to four of which may be configured in software as
analog inputs, a +3.3 V DC power supply point and ground, and a SYS_PWR_ON line are
brought out on auxiliary I/O header J4. Section 4.4 describes the use of these lines in more
detail.
User ’s Manual
33
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