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PIC16LC773 数据表(PDF) 97 Page - Microchip Technology |
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PIC16LC773 数据表(HTML) 97 Page - Microchip Technology |
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97 / 200 page  PIC16C77X © 1999 Microchip Technology Inc. Advance Information DS30275A-page 97 9.0 ADDRESSABLE UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER (USART) The Universal Synchronous Asynchronous Receiver Transmitter (USART) module is one of the two serial I/O modules. (USART is also known as a Serial Com- munications Interface or SCI). The USART can be con- figured as a full duplex asynchronous system that can communicate with peripheral devices such as CRT ter- minals and personal computers, or it can be configured as a half duplex synchronous system that can commu- nicate with peripheral devices such as A/D or D/A inte- grated circuits, Serial EEPROMs etc. The USART can be configured in the following modes: • Asynchronous (full duplex) • Synchronous - Master (half duplex) • Synchronous - Slave (half duplex) Bit SPEN (RCSTA<7>), and bits TRISC<7:6>, have to be set in order to configure pins RC6/TX/CK and RC7/ RX/DT as the Universal Synchronous Asynchronous Receiver Transmitter. The USART module also has a multi-processor com- munication capability using 9-bit address detection. FIGURE 9-1: TXSTA: TRANSMIT STATUS AND CONTROL REGISTER (ADDRESS 98h) R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R-1 R/W-0 CSRC TX9 TXEN SYNC — BRGH TRMT TX9D R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ - n =Value at POR reset bit7 bit0 bit 7: CSRC: Clock Source Select bit Asynchronous mode Don’t care Synchronous mode 1 = Master mode (Clock generated internally from BRG) 0 = Slave mode (Clock from external source) bit 6: TX9: 9-bit Transmit Enable bit 1 = Selects 9-bit transmission 0 = Selects 8-bit transmission bit 5: TXEN: Transmit Enable bit 1 = Transmit enabled 0 = Transmit disabled Note: SREN/CREN overrides TXEN in SYNC mode. bit 4: SYNC: USART Mode Select bit 1 = Synchronous mode 0 = Asynchronous mode bit 3: Unimplemented: Read as '0' bit 2: BRGH: High Baud Rate Select bit Asynchronous mode 1 = High speed 0 = Low speed Synchronous mode Unused in this mode bit 1: TRMT: Transmit Shift Register Status bit 1 = TSR empty 0 = TSR full bit 0: TX9D: 9th bit of transmit data. Can be parity bit. |
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