參數(shù)資料
型號： SM320F2812HFGM
廠商： TEXAS INSTRUMENTS INC
元件分類： 數(shù)字信號處理
英文描述： 16-BIT, 150 MHz, OTHER DSP, CQFP172
封裝： NCTB, CERAMIC, QFP-172
文件頁數(shù)： 116/147頁
文件大?。?/td> 1721K
代理商： SM320F2812HFGM
Peripherals
70
December 2004
SGUS053
4.6
Serial Communications Interface (SCI) Module
The F2812 device include two serial communications interface (SCI) modules. The SCI modules support
digital communications between the CPU and other asynchronous peripherals that use the standard
non-return-to-zero (NRZ) format. The SCI receiver and transmitter are double-buffered, and each has its own
separate enable and interrupt bits. Both can be operated independently or simultaneously in the full-duplex
mode. To ensure data integrity, the SCI checks received data for break detection, parity, overrun, and framing
errors. The bit rate is programmable to over 65 000 different speeds through a 16-bit baud-select register.
Features of each SCI module include:
Two external pins:
SCITXD: SCI transmit-output pin
SCIRXD: SCI receive-input pin
NOTE:
Both pins can be used as GPIO if not used for SCI.
Baud rate programmable to 64K different rates
Baud rate =
LSPCLK
(BRR
) 1) * 8
,
when BRR
≠ 0
=
LSPCLK
16
,
when BRR = 0
Data-word format
One start bit
Data-word length programmable from one to eight bits
Optional even/odd/no parity bit
One or two stop bits
Four error-detection flags: parity, overrun, framing, and break detection
Two wake-up multiprocessor modes: idle-line and address bit
Half- or full-duplex operation
Double-buffered receive and transmit functions
Transmitter and receiver operations can be accomplished through interrupt-driven or polled algorithms
with status flags.
Transmitter: TXRDY flag (transmitter-buffer register is ready to receive another character) and
TX EMPTY flag (transmitter-shift register is empty)
Receiver: RXRDY flag (receiver-buffer register is ready to receive another character), BRKDT flag
(break condition occurred), and RX ERROR flag (monitoring four interrupt conditions)
Separate enable bits for transmitter and receiver interrupts (except BRKDT)
Max bit rate
+ 150 MHz
2
8
+ 9.375
106 b s
Serial port performance is limited by I/O buffer switching speed. Internal prescalers must be adjusted such that the peripheral speed is less
than the I/O buffer speed limit—20 MHz maximum.
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