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PIC876 数据表(PDF) 97 Page - Microchip Technology |
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PIC876 数据表(HTML) 97 Page - Microchip Technology |
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97 / 218 page  2001 Microchip Technology Inc. DS30292C-page 95 PIC16F87X 10.0 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 Asynchro- nous Receiver Transmitter. The USART module also has a multi-processor com- munication capability using 9-bit address detection. REGISTER 10-1: 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 bit 7 bit 0 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 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ - n = Value at POR ’1’ = Bit is set ’0’ = Bit is cleared x = Bit is unknown |
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