PIC12F1822-I/MF (Microchip) PDF资料下载 Datasheet(14/109 页)

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型号：	PIC12F1822-I/MF
厂商：	Microchip Technology
文件页数：	14/109页
文件大小：	0K
描述：	IC MCU 8BIT FLASH 8DFN
产品培训模块：	8-bit PIC® Microcontroller Portfolio
标准包装：	120
系列：	PIC® XLP™ 12F
核心处理器：	PIC
芯体尺寸：	8-位
速度：	32MHz
连通性：	I²C，LIN，SPI，UART/USART
外围设备：	欠压检测/复位，POR，PWM，WDT
输入/输出数：	6
程序存储器容量：	3.5KB（2K x 14）
程序存储器类型：	闪存
EEPROM 大小：	256 x 8
RAM 容量：	128 x 8
电压 - 电源 (Vcc/Vdd)：	1.8 V ~ 5.5 V
数据转换器：	A/D 4x10b
振荡器型：	内部
工作温度：	-40°C ~ 85°C
封装/外壳：	8-VDFN 裸露焊盘
包装：	管件

203

7674F–AVR–09/09

ATmega164P/324P/644P

18.6

Data Transfer

Using the USART in MSPI mode requires the Transmitter to be enabled, i.e. the TXENn bit in

the UCSRnB register is set to one. When the Transmitter is enabled, the normal port operation

of the TxDn pin is overridden and given the function as the Transmitter's serial output. Enabling

the receiver is optional and is done by setting the RXENn bit in the UCSRnB register to one.

When the receiver is enabled, the normal pin operation of the RxDn pin is overridden and given

the function as the Receiver's serial input. The XCKn will in both cases be used as the transfer

clock.

After initialization the USART is ready for doing data transfers. A data transfer is initiated by writ-

ing to the UDRn I/O location. This is the case for both sending and receiving data since the

transmitter controls the transfer clock. The data written to UDRn is moved from the transmit buf-

fer to the shift register when the shift register is ready to send a new frame.

Note:

To keep the input buffer in sync with the number of data bytes transmitted, the UDRn register must

be read once for each byte transmitted. The input buffer operation is identical to normal USART

mode, i.e. if an overflow occurs the character last received will be lost, not the first data in the buf-

fer. This means that if four bytes are transferred, byte 1 first, then byte 2, 3, and 4, and the UDRn

is not read before all transfers are completed, then byte 3 to be received will be lost, and not byte

The following code examples show a simple USART in MSPIM mode transfer function based on

polling of the Data Register Empty (UDREn) Flag and the Receive Complete (RXCn) Flag. The

USART has to be initialized before the function can be used. For the assembly code, the data to

be sent is assumed to be stored in Register R16 and the data received will be available in the

same register (R16) after the function returns.

The function simply waits for the transmit buffer to be empty by checking the UDREn Flag,

before loading it with new data to be transmitted. The function then waits for data to be present

in the receive buffer by checking the RXCn Flag, before reading the buffer and returning the

value..

相关代理商/技术参数	参数描述
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