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TSC87C52-12CAD 参数 Datasheet PDF下载

TSC87C52-12CAD图片预览
型号: TSC87C52-12CAD
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS 0至33 MHz的可编程的8位微控制器 [CMOS 0 to 33 MHz Programmable 8?bit Microcontroller]
分类和应用: 微控制器和处理器外围集成电路光电二极管可编程只读存储器时钟
文件页数/大小: 24 页 / 184 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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TSC87C52  
EPROM  
EPROM Structure  
The TSC87C52 EPROM is divided in two different arrays:  
D
D
the code array:  
8 Kbytes.  
64 bytes.  
the encryption array:  
In addition a third non programmable array is implemented:  
D
the signature array:  
4 bytes.  
EPROM Lock System  
The program Lock system, when programmed, protects the on–chip program against software piracy.  
Encryption Array  
Within the EPROM array are 64 bytes of encryption array that are initially unprogrammed (all 1’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 encryption 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 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.  
EPROM Programming  
Set–up modes  
In order to program and verify the EPROM or to read the signature bytes, the TSC87C52 is placed in specific set–up  
modes (see Figure 8).  
Control and program signals must be held at the levels indicated in Table 6.  
Definition of terms  
Address Lines:  
Data Lines:  
P1.0–P1.7, P2.0–P2.4 respectively for A0–A12  
P0.0–P0.7 for D0–D7  
Control Signals: RST, PSEN, P2.6, P2.7, P3.3, P3.6, P3.7.  
Program Signals: ALE/PROG, EA/VPP.  
Table 6 EPROM Set–up Modes  
ALE/  
PROG  
Mode  
RST  
PSEN  
EA/VPP  
P2.6  
P2.7  
P3.3  
P3.6  
P3.7  
Program Code data  
Verify Code data  
1
1
0
0
12.75V  
1
0
0
1
1
0
1
1
1
1
1
Program Encryption Array  
Address 0–3Fh  
1
1
0
0
12.75V  
1
0
0
1
1
0
0
0
1
0
Read Signature Bytes  
1
MATRA MHS  
Rev. C – 10 Sept 1997  
11  
Preliminary