82C52通用異步收發(fā)機(jī)的功能及其編程方法

INTRODUCTION? 7-4
1.0 GLOSSARY OF DATA COMMUNICATION TERMS? 7-4
1.1 Clear to Send? . . . . . . . . . . . . 7-4
1.2 Data Set Ready? . . . . . . . . . . 7-4
1.3 Data Terminal Ready? . . . . . . 7-4
1.4 Framing Error? . . . . . . . . . . . . 7-4
1.5 Interrupt Driven I/O? . . . . . . . . 7-4
1.6 I/O Polling? . . . . . . . . . . . . . . . 7-4
1.7 Overrun Error? . . . . . . . . . . . . 7-5
1.8 Parity? . . . . . . . . . . . . . . . . . . 7-5
1.9 Parity Error? . . . . . . . . . . . . . . 7-5
1.10 Percentage Error in Baud Rate Generation. 7-5
1.11 Request to Send? . . . . . . . . . . 7-6
2.0 CONTROL REGISTERS? . . . . 7-6
2.1 UART Control Register? . . . . . 7-6
2.2 Baud Rate Select Register? . . 7-7
2.3 Modem Control Register? . . . . 7-8
3.0 STATUS REGISTERS . . . . . . 7-10
3.1 UART Status Register . . . . . . 7-10
3.2 Modem Status Register? . . . . 7-11
4.0 TRANSMIT/RECEIVE BUFFER REGISTERS? 7-11
4.1 Receiver Buffer Register? . . . . 7-11
4.2 Transmitter Buffer Register? . . 7-12
5.0 I/O MAPPED ADDRESSING . 7-12
5.1 I/O Mapped Addressing? . . . . 7-12
5.2 Memory Mapped I/O? . . . . . . . 7-13
5.3 I/O Addressing for the 82C52? 7-13
6.0 RESET OF THE 82C52 . . . . . 7-13
7.0 PROGRAMMING THE 82C52? 7-14