nandflash在嵌入式设备中广泛的应用，学些nandflash的重要性不言而喻，这里分析一段实例代码，不管是编码规范还是程序的结构都是很有价值的。下边是K9F1208U0M的实例代码
PCA9536 4bit I2C bus and SMBus
资料详细技术说明
The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide
a simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide
a simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
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