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| 型號(hào)： | P89C669FA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 80C51 8-bit microcontroller family with extended memory 96 kB Flash with 2 kB RAM |
| 中文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MS-018, SOT-187-2, LCC-44 |
| 文件頁(yè)數(shù)： | 17/33頁(yè) |
| 文件大小： | 827K |
| 代理商： | P89C669FA |
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Philips Semiconductors
P89C669
80C51 8-bit microcontroller family with extended memory
Product data
Rev. 02 — 13 November 2003
17 of 33
9397 750 12299
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
7.4 Security bits
The P89C669 has security bits to protect users’ firmware codes. With none of the
security bits programmed, the code in the program memory can be verified. When
only security bit 1 (see
Table 6
) is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes from the internal
memory. EA is latched on Reset and all further programming of EPROM is disabled.
When security bits 1 and 2 are programmed, in addition to the above, verify mode is
disabled. When all three security bits are programmed, all of the conditions above
apply and all external program memory execution is disabled.
[1]
[2]
P - programmed. U - unprogrammed.
Any other combination of security bits is not defined.
8.
Limiting values
[1]
The following applies to the Limiting values:
a) Stresses above those listed under Limiting values may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any conditions other than those described in
Section 9 “Static characteristics”
and
Section 10 “Dynamic characteristics”
of this specification is not implied.
b) This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive
static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.
c) Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V
SS
unless
otherwise noted.
Table 6:
Security Bits
[1][2]
EPROM security bits
Bit 1
U
Bit 2
U
Bit 3
U
Protection description
No program security features enabled. Flash is
programmable and verifiable.
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
EPROM is disabled.
Same as 2, also verification is disabled.
Same as 3, external execution is disabled.
1
2
P
U
U
3
4
P
P
P
P
U
P
Table 7:
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
T
amb
operating temperature
Limiting values
Conditions
under bias
Min
0
40
65
0
0.5
-
-
Max
+70
+85
+150
+13
V
DD
+ 0.5
20
1.5
Unit
°
C
°
C
°
C
V
V
mA
W
T
stg
V
I
storage temperature range
input voltage on EA/V
PP
pin to V
SS
input voltage on any other pin to V
SS
maximum I
OL
per I/O pin
power dissipation
I
I
, I
O
P
based on package heat
transfer, not device power
consumption
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