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CC2530: 关于TI-MAC协议在SmartRF06上的引脚配置问题

Part Number: CC2530

在TI-MAC协议栈中对cc25xx系列使用的开发板 SmartRF05 Evaluation Boards – Rev 1.3 and Rev 1.7上,joystick的引脚配置是怎么样的,为什么是以下形式

#define HAL_KEY_SW_1 0x01 // Joystick up
#define HAL_KEY_SW_2 0x02 // Joystick right

0x01代表的是什么意思?它能否对应到cc2530的某一个引脚上呢?