说明：  The CC2540 and CC2541 are cost-effective, low-power, and true system-on-chip (SoC) solutions for Bluetooth low energy applications. They enable robust BLE master or slave nodes to be built with very low total bill-of-material costs. The CC2540 and CC2541 combine the excellent performance of a leading RF transceiver with an industry-standard enhanced 8051 MCU, in-system programmable flash memory, 8-KB RAM, and many other powerful supporting features and peripherals. The CC2540 and CC2541 are suited for systems where very low power consumption is required. Very low-power sleep modes are available. Short transition times between operating modes further enable low power consumption