DS89C430 Datasheet, PDF (20/48 Pages) Dallas Semiconductor – Ultra-High-Speed Flash Microcontrollers

DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
Figure 6. Memory Map (as shown for the DS89C430)
FFFF
FFFF
INTERNAL
REGISTERS
128 Bytes SFR
FF
128 Bytes
Indirect
Addressing
80
7F
2F
20 ^{Bit Addressable}
1F _{Bank 3}
Bank 2
Bank 1
Bank 0
00
03FF
INTERNAL
MEMORY
1K x 8
SRAM
Data OR
prog mem
addr from
0000 ^{400 - 7FF}
3FFF
8K x 8
Flash
Memory
(Program)
2000
1FFF
8K x 8
Flash
Memory
(Program)
0000
External
Program
Memory
4000
0000
External
Data
Memory
03FF
0000
Memory Configuration
As illustrated in Figure 6, the DS89C430 incorporates two 8kB flash areas for on-chip program memory and 1kB of
SRAM for on-chip data memory or a particular range (400–7FF) of “alternate” program memory space. The
DS89C440 incorporates two 16kB flash memories and the DS89C450 incorporates two 32kB flash memories. The
DS89C430 uses an address scheme that separates program memory from data memory such that the 16-bit
address bus can address each memory area up to maximum of 64kB.
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