20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 201
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
Available stocks
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Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
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23. E
I/O C
XTERNAL
ONTROL
23.1 Overview
The Rabbit 3000’s external I/O space consists of 64 KB that is accessed by prefixing a
read or write instruction with the IOE instruction. These accesses can go onto the memory
bus or onto the external I/O bus (described below). There are three dedicated signal pins
(/IORD, /IOWR, /BUFEN) that toggle for all external I/O accesses, and eight I/O strobes
that can be associated with this external I/O space and directed out of Parallel Port E.
23.1.1 External I/O Bus
The Rabbit 3000 can enable a separate external I/O bus for external devices to keep bus
loading on the memory bus at an acceptable level. This bus consists of eight data lines on
Parallel Port A and up to six address lines on Parallel Port B. This functionality is mutu-
ally exclusive with the slave port and regular parallel I/O on Parallel Ports A and B.
When enabled, the address lines of the external I/O bus hold their value until a new value
is written to them. The data lines return to a tristate mode after each transaction.
See Section 23.1.2 for memory timing for external I/O accesses.
Chapter 23 External I/O Control
191
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