668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 54
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668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
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
Features
-
Other names
316-1016
- Current page: 54 of 312
- Download datasheet (2Mb)
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
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