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MSP430通用同步异步接收,传送通信接口
消耗积分:5 |
格式:rar |
大小:101 |
2009-06-30
马占云
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Contents
1 Introduction 1
1.1 Attributes of the MSP430 UART . . . 3
1.2 Data Format . 3
1.3 UART Hardware Registers . 4
2 Baud Rate Generation . . 6
2.1 Baud Rate Generation With the MCLK 8
2.2 Baud Rate Generation With the ACLK . 9
3 Software Routines 10
3.1 Non-Interrupt Processing . 10
3.2 Interrupt Processing . 12
3.2.1 MCLK Used as UART Clock . 12
3.2.2 ACLK Used as UART Clock . 16
3.3 Subroutines and .MACROs . . 20
3.3.1 Subroutines . 20
3.3.2 .MACROs . . . 21
4 References 24
Appendix A Definitions A-1
List of Figures
1 MSP430 USART Module . . 2
2 USART Switched to the UART Mode . . 3
3 RS232 Format (Levels at the MSP430) 4
4 RS232 Format (Levels on the Transmission Line) . 4
5 USART Control Registers Used in the UART Mode . 5
6 Baud Rate Generator . 6
7 Function of the Baud Rate Correction . . 8
List of Tables
1 Content of Baud Rate Registers UBR (MCLK = 1.048 MHz) . 9
2 Content of Baud Rate Registers UBR (ACLK = 32,768 Hz) . 10
1 Introduction 1
1.1 Attributes of the MSP430 UART . . . 3
1.2 Data Format . 3
1.3 UART Hardware Registers . 4
2 Baud Rate Generation . . 6
2.1 Baud Rate Generation With the MCLK 8
2.2 Baud Rate Generation With the ACLK . 9
3 Software Routines 10
3.1 Non-Interrupt Processing . 10
3.2 Interrupt Processing . 12
3.2.1 MCLK Used as UART Clock . 12
3.2.2 ACLK Used as UART Clock . 16
3.3 Subroutines and .MACROs . . 20
3.3.1 Subroutines . 20
3.3.2 .MACROs . . . 21
4 References 24
Appendix A Definitions A-1
List of Figures
1 MSP430 USART Module . . 2
2 USART Switched to the UART Mode . . 3
3 RS232 Format (Levels at the MSP430) 4
4 RS232 Format (Levels on the Transmission Line) . 4
5 USART Control Registers Used in the UART Mode . 5
6 Baud Rate Generator . 6
7 Function of the Baud Rate Correction . . 8
List of Tables
1 Content of Baud Rate Registers UBR (MCLK = 1.048 MHz) . 9
2 Content of Baud Rate Registers UBR (ACLK = 32,768 Hz) . 10
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