(1. The following description of the relevant 8051 MCU pins is accurate (C). A. The high and low levels of the pins have nothing to do with the selection of on-chip and off-chip ROMs of the microcontroller. B. When the pin is connected to a high level, the CPU only implements off-chip program memory. C. When the pin is connected to a low level, the CPU only implements off-chip program memory.)
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