20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 98
20-668-0003
Manufacturer Part Number
20-668-0003
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 20-668-0003
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Data Bus Width
8 bit
Maximum Clock Frequency
30 MHz
Operating Supply Voltage
0 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
40
Number Of Timers
8 & 10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
20-668-0003
316-1062
316-1062
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0003
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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The memory management unit accepts a 16-bit address from the processor and translates
it into a 20-bit address. The procedure to do this works as follows.
1. It is determined which segment the 16-bit address belongs to by inspecting the upper 4
2. Each segment has an 8-bit segment register. The 8-bit segment register is added to the
92
SEGSIZE = 0x13
XPC
STACKSEG = 0x11
DATASEG = 0x12
bits of the address. Every address must belong to one of the possible 4 segments.
upper 4 bits of the 16-bit address to create a 20-bit address. Wraparound occurs if the
addition would result in an address that does not fit in 20 bits.
Segment Register
STACKSEG
DATASEG
XPC
+
Boundary SEGSIZE[4..7]
Boundary SEGSIZE[0..3]
00
20-bit address
16-bit address
Table 8-2. Segment Size Register
Table 8-1. Segment Registers
Figure 8-2. Memory Segments
Boundary address stack segment.
Locates extended code segment in physical memory. Read and written
by processor instructions: ld a,xpc, ld xpc,a, lcall, lret, ljp
Locates stack segment in physical memory.
Locates data segment in physical memory.
0K
64K
Bits 7..4
Rabbit 2000 Microprocessor User’s Manual
Function
Boundary address data segment.
Extended code
XPC segment (8K)
Stack segment
(4K typ)
Data segment
Root segment
Bits 3..0
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