PWMGenConfigure设置问题

PWM0_BASE 和 PWM_BASE 

PWM_BASE应该是不正确的，TM4C123G 有两个PWM 模块 PWM0 and PWM1

PWMGenConfigure(PWM0_BASE, PWM_GEN_0, PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_NO_SYNC); //这个配置信息 配置内容你可以查看PWM.h中详细说明

#define PWM_GEN_MODE_DOWN 0x00000000 // Down count mode
#define PWM_GEN_MODE_UP_DOWN 0x00000002 // Up/Down count mode
#define PWM_GEN_MODE_SYNC 0x00000038 // Synchronous updates
#define PWM_GEN_MODE_NO_SYNC 0x00000000 // Immediate updates
#define PWM_GEN_MODE_DBG_RUN 0x00000004 // Continue running in debug mode
#define PWM_GEN_MODE_DBG_STOP 0x00000000 // Stop running in debug mode

LiangLiang wang1 说：

PWMGenConfigure(PWM_BASE, PWM_GEN_0, (PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_SYNC |
PWM_GEN_MODE_DBG_STOP));
PWMGenConfigure(PWM_BASE, PWM_GEN_1, (PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_SYNC |
PWM_GEN_MODE_DBG_STOP));
PWMGenConfigure(PWM_BASE, PWM_GEN_2, (PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_SYNC |
PWM_GEN_MODE_DBG_STOP));

以上是一个例程里对控制三相异步电机的PWM设置，我看tivaware的examples的设置都是

PWMGenConfigure(PWM0_BASE, PWM_GEN_0, PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_NO_SYNC);，什么情况才设置成PWMGenConfigure(PWM_BASE, PWM_GEN_0, (PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_SYNC |
PWM_GEN_MODE_DBG_STOP)); 呢？设置为这样还要进行哪些相关设置呢？它们之间有什么差别呢？