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参数资料
| 型号： | TSC87C51-33CBB |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 47/80页 |
| 文件大小： | 5152K |
| 代理商： | TSC87C51-33CBB |
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247
XMEGA A [MANUAL]
8077I–AVR–11/2012
Bit 1:0 – DREINTLVL[1:0]: Data Register Empty Interrupt Level
These bits enable the data register empty interrupt and select the interrupt level, as described in “Interrupts and
Programmable Multilevel Interrupt Controller” on page 125. The enabled interrupt will be triggered when the DREIF flag
in the STATUS register is set.
21.15.4 CTRLB – Control register B
Bit 7:5 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to zero
when this register is written.
Bit 4 – RXEN: Receiver Enable
Setting this bit enables the USART receiver. The receiver will override normal port operation for the RxD pin, when
enabled. Disabling the receiver will flush the receive buffer, invalidating the FERR, BUFOVF, and PERR flags.
Bit 3 – TXEN: Transmitter Enable
Setting this bit enables the USART transmitter. The transmitter will override normal port operation for the TxD pin, when
enabled. Disabling the transmitter (writing TXEN to zero) will not become effective until ongoing and pending
transmissions are completed; i.e., when the transmit shift register and transmit buffer register do not contain data to be
transmitted. When disabled, the transmitter will no longer override the TxD port.
Bit 2 – CLK2X: Double Transmission Speed
Setting this bit will reduce the divisor of the baud rate divider from16 to 8, effectively doubling the transfer rate for
asynchronous communication modes. For synchronous operation, this bit has no effect and should always be written to
zero. This bit must be zero when the USART communication mode is configured to IRCOM.
This bit is unused in master SPI mode operation.
Bit 1 – MPCM: Multiprocessor Communication Mode
This bit enables the multiprocessor communication mode. When the MPCM bit is written to one, the USART receiver
ignores all the incoming frames that do not contain address information. The transmitter is unaffected by the MPCM
setting. For more detailed information, see “Multiprocessor Communication Mode” on page 244.
This bit is unused in master SPI mode operation.
Bit 0 – TXB8: Transmit Bit 8
TXB8 is the ninth data bit in the character to be transmitted when operating with serial frames with nine data bits. When
used, this bit must be written before writing the low bits to DATA.
This bit is unused in master SPI mode operation.
Bit
765
43210
+0x04
–
RXEN
TXEN
CLK2X
MPCM
TXB8
Read/Write
R
R/W
Initial Value
0
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