The mode of encryption is CBC (Cipher Block Chaining) with 8-byte block size.
加密方式是块大小为 8 字节的 CBC(Cipher Block Chaining,密码块链接)。
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ST16C554 works in FIFO mode, receives and transmits data by (interrupt) mode with a 16 byte hardware transmit buffer, that will also greatly cut down the load on the CPU.