Model code of 89 series microcontroller

　　The model code of the 89 series microcontroller consists of three parts, namely prefix, model, and suffix. Their formats are as follows:
　　
　　 AT89C; ××× ××××
　　Where: AT is the prefix;
　　　　　89C×××× is the model;
　　　　　×××× is the suffix.
　　The following describes these three parts respectively, and explains the representation and meaning of the relevant parameters.

　　1. Prefix
　　　　　The prefix consists of the letters "AT", which indicates that the device is a product of ATMEL.
　　2. Model
　　　　　The model is represented by "89C××××" or "89LV××××" or "89S××××".
　　　　 In "89C××××", 9 means that it contains internal Flash memory; C means it is a CMOS product.
　　　　 In "89LV××××", LV means low voltage product.
　　　　 In "89S××××", S means that it contains downloadable Flash memory.
　　　　 The ×××× in this part represents the device model number, for example: 51, 1051, 8252, etc.
　　3. Suffix
　　　　 The suffix consists of four parameters "××××". The representation and meaning of each parameter are different. There is a "-" sign between the model and the suffix. The
　　　　 first parameter × in the suffix is ​​used to indicate the speed, and its meaning is as follows:
　　　　 × = 12, indicating a speed of 12MHz,
　　　　 × = 16, indicating a speed of 16MHz,
　　　　 × = 20, indicating a speed of 20MHz,
　　　　 × = 24, indicating a speed of 24MHz,

　　　　 and the second parameter × in the suffix is ​​used to indicate the package. Its meaning is as follows:
　　　　 × = D, Cerdip.
　　　　 × = J, plastic J-lead chip carrier.
　　　　 × = L, leadless chip carrier.
　　　　 × = P, indicating a plastic dual in-line DIP package.
　　　　 × = S, indicating a SOIC package.
　　　　 × = Q, indicating a PQFP package.
　　　　 × = A, indicating a TQFP package.
　　　　 × = W, indicating a bare chip.

　　　　 The third parameter × in the suffix is ​​used to indicate the temperature range, and its meaning is as follows:
　　　　 × = C, indicating a commercial product with a temperature range of 0 to +70°C.
　　　　 ×＝I, indicating industrial products, the temperature range is -40 to +85℃.
　　　　 ×＝A, indicating automotive products, the temperature range is -40 to +125℃.
　　　　 ×＝M, indicating military products, the temperature range is -55 to +150℃.

　　　　 The fourth parameter × in the suffix is ​​used to describe the processing of the product, and its meaning is as follows:
　　　　 × is empty, indicating that the processing technology is standard technology.
　　　　 ×＝/883, indicating that the processing technology adopts the MIL-STD-883 standard.

　　For example, there is a single-chip microcomputer model "AT89C51-12PI", which means that the single-chip microcomputer is a Flash single-chip microcomputer of ATMEL, with a C51 structure inside, a speed of 12MHz, a DIP package, an industrial product, and is produced according to the standard processing technology.