DS89C420-QCL Datasheet, PDF (9/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
FFFFh
PROGRAM
MEMORY
64k
DATA
MEMORY
0000h
FFh
7Fh
0000h
INDIRECT
RAM
DIRECT
RAM
255 _DIRECT FFh
SPECIAL
FUNCTION
REGISTERS
128
7Fh
Figure 4-1. Memory Map
Figure 4-2. Register Map
FFh
7Fh
2Fh 7F 7E
2Eh 77 76
2Dh 6F 6E
2Ch 67 66
2Bh 5F 5E
2Ah 57 56
29h 4F 4E
28h 47 46
27h 3F 3E
26h 37 36
25h 2F 2E
24h 27 26
23h ^{1F 1E}
22h 17 16
21h ^{0F 0E}
20h ^{07 06}
1Fh
18h
17h
10h
0Fh
08h
07h
00h
MSB
INDIRECT RAM
DIRECT RAM
7D 7C 7B 7A
75 74 73 72
6D 6C 6B 6A
65 64 63 62
5D 5C 5B 5A
55 54 53 52
4D 4C 4B 4A
45 44 43 42
3D 3C 3B 3A
35 34 333 32
2D 2C 2B 2A
25 24 23 22
1D 1C 1B 1A
15 14 13 12
0D 0C 0B 0A
05 04 03 02
BANK 3
BANK 2
BANK 1
BANK 0
79 78
71 70
69 68
61 60
59 58
51 50
49 48
41 40
39 38
31 30
29 28
21 20
19 18
11 10
09 08
01 00
LSB
Figure 4-3. Scratchpad Register Addressing
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