參數(shù)資料
型號(hào)： TS87C54X2-MCE
廠商： Atmel
文件頁數(shù)： 30/62頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 16K OTP 40MHZ 44VQFP
標(biāo)準(zhǔn)包裝： 160
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40/20MHz
連通性： UART/USART
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)器類型： OTP
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 44-QFP
包裝： 托盤
36
4431E–8051–04/06
AT/TS8xC54/8X2
16. TS80C54/58X2 ROM
16.1
ROM Structure
The TS80C54/58X2 ROM memory is in three different arrays:
the code array:16/32 Kbytes.
the encryption array:64 bytes.
the signature array:4 bytes.
16.2
ROM Lock System
The program Lock system, when programmed, protects the on-chip program against software
piracy.
16.2.1
Encryption Array
Within the ROM array are 64 bytes of encryption array that are initially unprogrammed (all FF’s).
Every time a byte is addressed during program verify, 6 address lines are used to select a byte
of the encryption array. This byte is then exclusive-NOR’ed (XNOR) with the code byte, creating
an encrypted verify byte. The algorithm, with the encryption array in the unprogrammed state,
will return the code in its original, unmodified form.
When using the encryption array, one important factor needs to be considered. If a byte has the
value FFh, verifying the byte will produce the encryption byte value. If a large block (>64 bytes)
of code is left unprogrammed, a verification routine will display the content of the encryption
array. For this reason all the unused code bytes should be programmed with random values.
This will ensure program protection.
16.2.2
Program Lock Bits
The lock bits when programmed according to Table 16-1. will provide different level of protection
for the on-chip code and data.
U: unprogrammed
P: programmed
16.2.3
Signature bytes
The TS80C54/58X2 contains 4 factory programmed signatures bytes. To read these bytes, per-
form the process described in section 8.3.
16.2.4
Verify Algorithm
Refer to 17.3.4
Table 16-1.
Program Lock bits
Program Lock Bits
Protection Description
Security
level
LB1
LB2
LB3
1
U
No program lock features enabled. Code verify will still be encrypted by
the encryption array if programmed. MOVC instruction executed from
external program memory returns non encrypted data.
2
P
U
MOVC instruction executed from external program memory are disabled
from fetching code bytes from internal memory, EA is sampled and
latched on reset.
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TS87C54X2-MIA 功能描述:IC MCU 8BIT 16K OTP 40MHZ 40-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件
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