8051 ISP by COM Port
2.3 Requirement on the MCU’s Operating Frequency
There is no restriction on the MCU’s operating frequency for ISP operation. All frequencies between 3MHz and
40MHz are acceptable. The 8051 MCU will automatically build a proper baudrate according to its operating
frequency. It is recommended that the user uses the following specific frequencies: 11.0592MHz, 18.432MHz,
22.1184MHz or 36.864MHz. All these frequencies can generate the exact baudrate of 115200bps, which will shorten
the data transmission time during ISP operation.
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