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BK3254SS28 Datasheet(PDF) 11 Page - Beken Corporation |
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BK3254SS28 Datasheet(HTML) 11 Page - Beken Corporation |
11 / 17 page ![]() BK3254 Datasheet v 0.5 © 2011 Beken Corporation Proprietary and Confidential Page 11 of 17 3.2. PWM Timer and Watch Dog Timer There are two sets of PWM timers. One fast set uses 1 MHz clock as main clock, and another slow set uses 32 kHz clock as main clock. Each set has three 16 bits counter with 4 bit pre-divider. First two timers in slow set can be used to LED duty cycle control. The watch dog timer runs with 32 kHz clock, with period from 0.6 ms to 38 second. 3.3. Power Management The BK3254 can work with power supply from 2.8 V to 5.5 V, that it can work directly with USB power supply. The BK3254 can enter into shut down mode when there is no active connection. The shut mode can be waked up by any GPIO. 3.4. MCU The 16 bit RISC MCU has Cache and DMA bus, to support efficient execution and frequently data exchange. The JTAG interface can be used to on-line debug, which can be also configured as GPIO. Besides 26 MHz crystal, the MCU can run with internal DPLL clock, or 32 kHz ring oscillator clock, with programmable divided ratio. 3.5. I2C and UART Interface There is one set of I2C interface and one set of UART interface for debug or external MCU control the BK3254. 3.6. FLASH Access Interface The BK3254 MCU is running with the external FLASH program memory and the internal instruction cache. The external FLASH can be also used to store user data such as key configuration and Bluetooth paring information. 3.7. SPI The 4-wires SPI supports high speed data communication, which can be used as interface to either external FLASH or LCD controller. |
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