20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 54
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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5.3 Operation
5.3.1 Memory Management Unit (MMU)
Code execution takes place in the 64 KB logical memory space, which is divided into four
segments: root, data, stack, and extended (XMEM). The root segment is always mapped
starting at physical address 0x00000, but the other segments can be remapped to start at
any physical 4 KB block boundary.
The data and stack segment mappings are set by writing to the appropriate register, as
shown in Table 5-1. The DATASEG and STACKSEG registers provide backwards
compatibility to the Rabbit 2000 processor.
Each of these registers provides a 4 KB offset that is added to the logical address to pro-
vide a physical address as shown in Figure 5-3.
44
DATASEG
STACKSEG
XPC
Register
Table 5-1. Memory Management Registers
Figure 5-3. MMU Operation
Segment
XMEM
Stack
Data
8 bits
8 bits
8 bits
Size
Loaded via instructions
LD XPC,A and LD A,XPC
Rabbit 3000 Microprocessor User’s Manual
Comments
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