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| 型號： | IS89C52-24PLI |
| 廠商： | INTEGRATED SILICON SOLUTION INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| 中文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 38/50頁 |
| 文件大?。?/td> | 425K |
| 代理商： | IS89C52-24PLI |
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IS89C52
38
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
ISSI
Program Memory Lock System
The program lock system, when programmed, protects
the code against software piracy. The IS89C52 has a
three-level program lock system (see Table 14). The lock-
bits are programmed in the same manner as the program
memory.
The detailed lock-bits features are listed in Table 14.
Table 14. Program Lock Bits
LB1
U
P
LB2
U
U
LB3
U
U
Protection Type
No Program Lock Features enabled.
MOVC instructions executed from external program memory are diabled
form fetching code bytes from internal memory,
EA
is sampled and
latched on Reset and further programming of the Flash is disabled.
Same as 2, also verify is disabled.
Same as 3, also external execution is disabled.
1
2
3
4
P
P
P
P
U
P
FLASH MEMORY
Programming the IS89C52
The IS89C52 is normally shipped with the on-chip Flash
memory array in the erased state (i.e., contents = FFH)
and ready to be programmed. The IS89C52 is programmed
byte-by-byte in programming mode. Before the on-chip
flash code memory can be re-programmed, the entire
memory array must be erased electrically.
Programming Interface
Every code byte in the Flash array can be written and the
entire array can be erased using the appropriate
combination of control signals. The write operation cycles
is self-timed once initiated, will automatically time itself to
completion. The programming interface is shown in
Table 15 and Figures 27 and 28.
Table 15. Flash Programming Mode
Mode
RST
PSEN
ALE/
PROG
EA
/V
PP
P2.6
P2.7
P3.6
P3.7
Program Code Data
H
L
12V
L
H
H
H
Verify Code Data
H
L
H
H
L
L
H
H
Program Lock Bit 1
H
L
12V
H
H
H
H
Program Lock Bit 2
H
L
12V
H
H
L
L
Program Lock Bit 3
H
L
12V
H
L
H
L
Read Signature Byte
H
L
H
H
L
L
L
L
Chip Erase
H
L
12V
H
L
L
L
相關(guān)PDF資料 |
PDF描述 |
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| IS89C52-24PQ | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24PQI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24WI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-40PL | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS89C52-24PQ | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24PQI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24W | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-24WI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-40PL | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
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