STC micro STC8A8K64D4 Series - Unique ID Number and Important Parameter (CHIPID) Stored in Read-Only Special Function Register; Interpretation of Global Unique ID Number in CHIP

STC8A8K64D4 Series Manual
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7.4 Unique ID number and important parameter (CHIPID) stored in
read-only special function register
Some STC8A8K64D4 series microcontrollers have built-in 32-byte read-only special function register CHIPID. The content
in CHIPID can only be read by the user program and cannot be modified. Using the data in CHIPID to encrypt user programs is the
optimal solution officially recommended by STC.
Related registers
Symbol
Description
Address
Bit address and symbol
Reset value
B7
B6
B5
B4
B3
B2
B1
B0
CHIPID00
hardware digital ID00
FDE0H
Globally Unique ID Number (0th byte)
nnnn,nnnn
CHIPID01
hardware digital ID01
FDE1H
Globally Unique ID Number (1st byte)
nnnn,nnnn
CHIPID02
hardware digital ID02
FDE2H
Globally Unique ID Number (2nd byte)
nnnn,nnnn
CHIPID03
hardware digital ID03
FDE3H
Globally Unique ID Number (3rd byte)
nnnn,nnnn
CHIPID04
hardware digital ID04
FDE4H
Globally Unique ID Number (4th byte)
nnnn,nnnn
CHIPID05
hardware digital ID05
FDE5H
Globally Unique ID Number (5th byte)
nnnn,nnnn
CHIPID06
hardware digital ID06
FDE6H
Globally Unique ID Number (6th byte)
nnnn,nnnn
CHIPID07
hardware digital ID07
FDE7H
Internal 1.19V reference signal source (high byte)
nnnn,nnnn
CHIPID08
hardware digital ID08
FDE8H
Internal 1.19V reference signal source (low byte)
nnnn,nnnn
CHIPID09
hardware digital ID09
FDE9H
32K Power-down wake-up timer frequency(high byte)
nnnn,nnnn
CHIPID10
hardware digital ID10
FDEAH
32K Power-down wake-up timer frequency (low byte)
nnnn,nnnn
CHIPID11
hardware digital ID11
FDEBH
IRC parameter of 22.1184MHz (27M band)
nnnn,nnnn
CHIPID12
hardware digital ID12
FDECH
IRC parameter of 24MHz (27M band)
nnnn,nnnn
CHIPID13
hardware digital ID13
FDEDH
IRC parameter of 20MHz (27M band)
nnnn,nnnn
CHIPID14
hardware digital ID14
FDEEH
IRC parameter of 27MHz (27M band)
nnnn,nnnn
CHIPID15
hardware digital ID15
FDEFH
IRC parameter of 30MHz (27M band)
nnnn,nnnn
CHIPID16
hardware digital ID16
FDF0H
IRC parameter of 33.1776MHz (27M band)
nnnn,nnnn
CHIPID17
hardware digital ID17
FDF1H
IRC parameter of 35MHz (44M band)
nnnn,nnnn
CHIPID18
hardware digital ID18
FDF2H
IRC parameter of 36.864MHz(44M band)
nnnn,nnnn
CHIPID19
hardware digital ID19
FDF3H
IRC parameter of 40MHz(44M band)
nnnn,nnnn
CHIPID20
hardware digital ID20
FDF4H
IRC parameter of 45MHz(44M band)
nnnn,nnnn
CHIPID21
hardware digital ID21
FDF5H
VRTRIM parameter of 6M band
nnnn,nnnn
CHIPID22
hardware digital ID22
FDF6H
VRTRIM parameter of 10M band
nnnn,nnnn
CHIPID23
hardware digital ID23
FDF7H
VRTRIM parameter of 27M band
nnnn,nnnn
CHIPID24
hardware digital ID24
FDF8H
VRTRIM parameter of 44M band
nnnn,nnnn
CHIPID25
hardware digital ID25
FDF9H
00H
nnnn,nnnn
CHIPID26
hardware digital ID26
FDFAH
User program space end address (high byte)
nnnn,nnnn
CHIPID27
hardware digital ID27
FDFBH
Chip test time (year)
nnnn,nnnn
CHIPID28
hardware digital ID28
FDFCH
Chip test time (month)
nnnn,nnnn
CHIPID29
hardware digital ID29
FDFDH
Chip test time (day)
nnnn,nnnn
CHIPID30
hardware digital ID30
FDFEH
Chip package form number
nnnn,nnnn
CHIPID31
hardware digital ID31
FDFFH
5AH
nnnn,nnnn
7.4.1 Interpretation of Global Unique ID Number in CHIP
Symbol
Description
Address
Bit address and symbol
Reset
value
B7
B6
B5
B4
B3
B2
B1
B0
CHIPID00
hardware digital ID00
FDE0H
Globally Unique ID Number (0th byte)
nnnn,nnnn
CHIPID01
hardware digital ID01
FDE1H
Globally Unique ID Number (1st byte)
nnnn,nnnn
CHIPID02
hardware digital ID02
FDE2H
Globally Unique ID Number (2nd byte)
nnnn,nnnn
CHIPID03
hardware digital ID03
FDE3H
Globally Unique ID Number (3rd byte)
nnnn,nnnn
CHIPID04
hardware digital ID04
FDE4H
Globally Unique ID Number (4th byte)
nnnn,nnnn
CHIPID05
hardware digital ID05
FDE5H
Globally Unique ID Number (5th byte)
nnnn,nnnn
CHIPID06
hardware digital ID06
FDE6H
Globally Unique ID Number (6th byte)
nnnn,nnnn
[CHIPID0, CHIPID1]: 16-bit MCU ID, which is used to distinguish different MCU models (higher bit first).
The commonly used MCU IDs of STC8A8K64D4 series are shown in the following table:
STC8A8K16D4 (F7F1)
STC8A8K32D4 (F7F2)
STC8A8K48D4 (F7F5)
STC8A8K60D4 (F7F3)
STC8A8K64D4 (F7F4)
[CHIPID2, CHIPID3]: 16-bit test machine number (higher bit first).
[CHIPID4, CHIPID5, CHIPID6]: 24-bit test serial number (higher bit first).