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型號(hào)：	S80C52CXXX-16
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQCC44
封裝：	PLASTIC, LCC-44
文件頁(yè)數(shù)：	537/1021頁(yè)
文件大小：	15196K
代理商：	S80C52CXXX-16

32072H–AVR32–10/2012

AT32UC3A3

Writing 0x2 to the MR.MODE field configures the USART to operate in hardware handshaking

mode. The receiver will drive its RTS pin high when disabled or when the Reception Buffer Full

bit (CSR.RXBUFF) is set by the Buffer Full signal from the Peripheral DMA controller. If the

receiver RTS pin is high, the transmitter CTS pin will also be high and only the active character

transmissions will be completed. Allocating a new buffer to the DMA controller by clearing

RXBUFF, will drive the RTS pin low, allowing the transmitter to resume transmission. Detected

level changes on the CTS pin are reported by the CTS Input Change bit in the Channel Status

Mask Register is set. CSR.CTSIC is cleared when reading CSR.

Figure 25-18 illustrates receiver functionality, and Figure 25-19 illustrates transmitter

functionality.

Figure 25-18. Receiver Behavior when Operating with Hardware Handshaking

Figure 25-19. Transmitter Behavior when Operating with Hardware Handshaking

Modem Mode

The USART features a modem mode, supporting asynchronous communication with the follow-

ing signal pins: Data Terminal Ready (DTR), Data Set Ready (DSR), Request to Send (RTS),

Clear to Send (CTS), Data Carrier Detect (DCD), and Ring Indicator (RI). Modem mode is

enabled by writing 0x3 to MR.MODE. The USART will behave as a Data Terminal Equipment

(DTE), controlling DTR and RTS, while detecting level changes on DSR, DCD, CTS, and RI.

Table 25-8 shows USART signal pins with the corresponding standardized modem connections.

Table 25-8.

Circuit References

USART Pin

Direction

From terminal to modem

From terminal to modem

From terminal to modem

From modem to terminal

From terminal to modem

相關(guān)PDF資料	PDF描述
S80C52CXXX-25SHXXX	8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQCC44
S80C32-20SHXXX:D	8-BIT, 20 MHz, MICROCONTROLLER, PQCC44
S80C32-20SHXXX:R	8-BIT, 20 MHz, MICROCONTROLLER, PQCC44
S80C32-40SHXXX:RD	8-BIT, 40 MHz, MICROCONTROLLER, PQCC44
S80C52XXX-12:RD	8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQCC44

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
S80C52T-12	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C52T-16	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C52T-20	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C52T-25	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C52T-30	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller

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