101-1017 Rabbit Semiconductor, 101-1017 Datasheet - Page 40
![no-image](/images/no-image-200.jpg)
101-1017
Manufacturer Part Number
101-1017
Description
KIT DEV POWERCORE 3800 INT'L
Manufacturer
Rabbit Semiconductor
Series
PowerCore FLEXr
Type
MPU Moduler
Datasheet
1.101-1007.pdf
(240 pages)
Specifications of 101-1017
Contents
RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
Processor To Be Evaluated
PowerCore 38xx
Interface Type
Ethernet
For Use With/related Products
RCM3800
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 40 of 240
- Download datasheet (3Mb)
4.1.1 Internal and External Buses
The Rabbit 3000 address lines (A0–A19) and all the data lines (D0–D7) are routed inter-
nally to the onboard flash memory, SRAM, and Ethernet chips. These lines do not appear
on header J4. It would be undesirable (and unnecessary) to run these lines to the mother-
board as they must operate at high frequencies and any additional load capacitance would
be undesirable.
A completely separate I/O bus is implemented using eight data lines and six address lines.
Various strobes can be implemented to clock data to or from the bus. The I/O bus is an
option that can be enabled by the user’s program as explained below. The eight bidirec-
tional I/O lines share pins with Parallel Port A, and the six address lines share pins with
part of Parallel Port B. Although only 64 read or write addresses are available directly, it
easy to expand the register space of the bus to be as large as desired by adding additional
address bits implemented using a register loadable as one of the 64 registers. Another
approach is to use additional separate strobe lines to create additional 64-register spaces.
Rabbit I/O instructions are used to access the registers created on the I/O bus. Strobes are
enabled by software setup of individual pins on Parallel Port E. More details are available
in the Rabbit 3000 Users’ Manual.
Parallel Port A can also be used as an external I/O data bus to isolate external I/O from the
main data bus. The pins on Parallel Port B used as I/O bus address lines can be used as
individual lines when the I/O bus is not enabled. Parallel Port B pins PB2–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
4.1.1.1 Handling Stateful I/O Registers
I/O registers are often either readable or writable, but not both in order to save hardware
expense or because the functionality does not fit a read/write model. For example, if writ-
ing a certain bit in a register causes a momentary action to take place, the bit in the register
does not really exist and there is nothing to read back.
If an I/O register is stateful, it is a write register that holds bits that have a continuing
meaning over time. If this information has to be changed and restored at different priority
levels, for example, in a main program and in an interrupt routine, there must be a way to
read the contents of the register and restore it. One approach is to make the register read-
able, but this requires extra hardware. The other approach is to establish a shadow register
in memory that holds an echo of the register contents—the shadow register is loaded each
time the register is loaded. Care must be taken with shadow registers to ensure that an
interrupt cannot take place when the contents of the shadow register differ from those of
the I/O register. The Rabbit 3000 Users’ Manual provides additional information.
32
PowerCore FLEX
Related parts for 101-1017
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![101-1274](/photos/9/21/92158/101-1274_tmb.jpg)
Part Number:
Description:
KIT DEV STANDARD RCM5700
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-1270](/photos/9/21/92161/101-1270_tmb.jpg)
Part Number:
Description:
BL4S200 TOOL KIT
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0577](/photos/37/60/376010/bl2500_600_tmb.jpg)
Part Number:
Description:
KIT DEV FOR BL2500 COYOTE
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0502](/photos/26/93/269307/101_0541a_tmb.jpg)
Part Number:
Description:
Microcontroller Modules & Accessories Keypad/Display Unit 5V Panel Mount
Manufacturer:
Rabbit Semiconductor
![101-0106](/images/no-image3.png)
Part Number:
Description:
Single Board Computers 24VDC/110 Power Supp
Manufacturer:
Rabbit Semiconductor
![101-0961](/images/no-image3.png)
Part Number:
Description:
MODULE RABBITCORE RCM3720
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0522](/images/no-image3.png)
Part Number:
Description:
MODULE RABBITCORE RCM3220
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0521](/images/no-image3.png)
Part Number:
Description:
MODULE RABBITCORE RCM3210
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0788](/images/no-image3.png)
Part Number:
Description:
COMPUTER SGL-BOARD OP6600 W/SRAM
Manufacturer:
Rabbit Semiconductor
Datasheet:
![101-0820](/images/no-image3.png)
Part Number:
Description:
COMPUTER SGL-BD BL2000 SRAM/FLSH
Manufacturer:
Rabbit Semiconductor