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HCS362

更新时间: 2024-09-21 04:20:47
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美国微芯 - MICROCHIP 存储
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描述
Memory Programming Specification

HCS362 数据手册

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HCSXXX  
HCSXXX Memory Programming Specification  
This document includes the  
programming specifications for the  
following devices:  
1.2  
Program/Verify Mode  
The Program/Verify mode for the KEELOQ devices  
allows programming for all memory locations within the  
device being programmed. With the exception of the  
decoders, these pins are also used to verify the memory  
arrays.  
• HCS200  
• HCS201  
• HCS300  
• HCS301  
• HCS320  
• HCS360  
• HCS361  
• HCS362  
• HCS410  
• HCS412  
• HCS500  
• HCS512  
• HCS515  
1.0  
PROGRAMMING THE HCSXXX  
®
All of the KEELOQ devices are programmed using a  
serial method. This Serial mode allows KEELOQ  
devices to be programmed while in users' systems,  
which increases the flexibility of designing  
cryptographic encoders, decoders and transponders  
into electronic systems. While some of the devices are  
capable of being programmed through wireless  
communications, the subject of this document is  
focused on wired programmers that make contact with  
the KEELOQ products while the components are in-  
circuit or in a programmer socket. Additionally, this  
programming specification only applies to all KEELOQ  
devices listed above in all packages.  
Note:  
For the purpose of this document,  
“KEELOQ devices” and “KEELOQ products”  
refers to all of the components listed  
above.  
1.1  
Programming Algorithm  
Requirements  
Depending on the device being programmed, the  
method for entering Programming mode can be  
achieved through the use of a combination of logic level  
signals applied to the programming pins. One or two  
pins are capable of accepting clock signals, while  
another pin is dedicated to bidirectional data. These  
pins are detailed in Table 1-1.  
Additionally, the programming voltage range for VDD is  
+5V ± 10% for all the KEELOQ devices. There is not a  
requirement to apply high voltages to any of the pins  
beyond the level of VDD in order to enter the  
Programming mode. For more details about pin  
configurations during programming, refer to Table 1-1.  
2004 Microchip Technology Inc.  
Preliminary  
DS41256A-page 1  

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