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CC3200 串口配置问题

Other Parts Discussed in Thread: CC3200

请教一个问题, 我在代码中如下配置UART1

MAP_UARTConfigSetExpClk(UARTA1_BASE, MAP_PRCMPeripheralClockGet(PRCM_UARTA1),
            19200,  (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
                    UART_CONFIG_PAR_EVEN));

配置时设置的波特率是19200,可是用示波器实际测量时串口的波特率只有600多,  这可能是什么原因呢?