AT80F52-16AI 查看數據表（PDF） - Atmel Corporation
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AT80F52-16AI Datasheet PDF : 19 Pages
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Program Memory Lock Bits
The AT80F52 has three lock bits that can be left unpro-
grammed (U) or can be programmed (P) to obtain the addi-
tional features listed in the following table.
Lock Bit Protection Modes
Program Lock Bits
LB1 LB2 LB3
1
U
U
U
2
P
U
U
3
P
P
U
4
P
P
P
Protection Type
No program lock features.
MOVC instructions executed
from external program
memory are disabled from
fetching code bytes from
internal memory, EA is
sampled and latched on reset,
and further programming of
the QuickFlash memory is
disabled.
Same as mode 2, but verify is
also disabled.
Same as mode 3, but external
execution is also disabled.
When lock bit 1 is programmed, the logic level at the EA pin
is sampled and latched during reset. If the device is pow-
ered up without a reset, the latch initializes to a random
value and holds that value until reset is activated. The
latched value of EA must agree with the current logic level
at that pin in order for the device to function properly.
Programming/Verifying the QuickFlash
The AT80F52 can only be programmed by Atmel. Cus-
tomer codes should be submitted in duplicate on a floppy
disk or uploaded to Atmel’s bulletin board or Web site. The
code should be in the Intel Hex format. The desired states
of the Lock Bits should be specified. Once programmed,
the code memory and Lock Bits cannot be erased or repro-
grammed.
Please consult the factory or Atmel’s representatives for
details on submitting custom codes.
Program Verify: If lock bits LB1 and LB2 have not been
programmed, the programmed code data can be read back
via the address and data lines for verification. The lock bits
cannot be verified directly. Verification of the lock bits is
achieved by observing that their features are enabled.
Reading the Signature Bytes: The signature bytes are
read by the same procedure as a normal verification of
locations 030H, 031H, and 032H, except that P3.6 and
P3.7 must be pulled to a logic low. The values returned are
as follows.
(030H) = 1EH indicates manufactured by Atmel
(031H) = 80H indicates QuickFlash
(032H) = 02H indicates AT80F52
QuickFlash Verification Modes
Mode
Read Code Data
Read Signature Byte
RST
H
H
PSEN
L
L
ALE
H
H
EA
P2.6 P2.7 P3.6 P3.7
H
L
L
H
H
H
L
L
L
L
3-26
AT80F52
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