DS89C430 Maxim, DS89C430 Datasheet - Page 20

• Manufacturer Part Number: DS89C430
• Description: The DS89C430 and DS89C450 offer the highest performance available in 8051-compatible microcontrollers
• Manufacturer: Maxim

Figure 6. Memory Map (as shown for the DS89C430)
Memory Configuration
As illustrated in
SRAM for on-chip data memory or a particular range (400–7FF) of “alternate” program memory space. 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.
FF
80
7F
2F
20
1F
00
Bit Addressable
128 Bytes
Indirect
Addressing
Bank 3
Bank 2
Bank 1
Bank 0
128 Bytes SFR
REGISTERS
Figure
INTERNAL
6, the DS89C430 incorporates two 8kB flash areas for on-chip program memory and 1kB of
03FF
0000
3FFF
2000
1FFF
0000
INTERNAL
MEMORY
(Program)
prog mem
addr from
Memory
(Program)
400 - 7FF
8K x 8
Data OR
Memory
8K x 8
SRAM
Flash
1K x 8
Flash
DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
20 of 46
FFFF
4000
0000
External
Program
Memory
FFFF
03FF
0000
External
Data
Memory