MSP430FR2433: USCI中的UCLK是什么时钟？

ShineRoyal

Part Number: MSP430FR2433

eusci_a_uart.h中有以下定义：

1
2
3
4
5
6
7
8
9
10
//*****************************************************************************
//
// The following are values that can be passed to the param parameter for
// functions: EUSCI_A_UART_init().
//
//*****************************************************************************
#define EUSCI_A_UART_CLOCKSOURCE_UCLK                              UCSSEL__UCLK
#define EUSCI_A_UART_CLOCKSOURCE_SMCLK                            UCSSEL__SMCLK
#define EUSCI_A_UART_CLOCKSOURCE_ACLK                                      0x40
#define EUSCI_A_UART_CLOCKSOURCE_MODCLK                                    0x40
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

//*****************************************************************************
//
// The following are values that can be passed to the param parameter for
// functions: EUSCI_A_UART_init().
//
//*****************************************************************************
#define EUSCI_A_UART_CLOCKSOURCE_UCLK                              UCSSEL__UCLK
#define EUSCI_A_UART_CLOCKSOURCE_SMCLK                            UCSSEL__SMCLK
#define EUSCI_A_UART_CLOCKSOURCE_ACLK                                      0x40
#define EUSCI_A_UART_CLOCKSOURCE_MODCLK                                    0x40

而手册中提供了3种时钟源：UCLK、SMCLK和Device specific。