Read Microcontroller ATMEGA162PV Heximal out after decapsulate the MCU ATmega162PV and break MCU security fuse bit, the status of MCU will be turned from locked to unlocked one;
A data transmission is initiated by loading the transmit buffer with the data to be transmitted. The CPU can load the transmit buffer by writing to the UDRn I/O location.
The buffered data in the transmit buffer will be moved to the Shift Register when the Shift Register is ready to send a new frame. The Shift Register is loaded with new data if it is in idle state (no ongoing transmission) or immediately after the last stop bit of the previous frame is transmitted if Read Microcontroller atmega640 software.
When the Shift Register is loaded with new data, it will transfer one complete frame at the rate given by the Baud Register, U2Xn bit or by XCKn depending on mode of operation.
The following code examples show a simple USART transmit function based on polling of the Data Register Empty (UDREn) Flag. When using frames with less than eight bits, the most significant bits written to the UDRn are ignored after Read chip atmega640v flash.
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 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.
If the Data Register Empty interrupt is utilized, the interrupt routine writes the data into the buffer. If 9-bit characters are used (UCSZn = 7), the ninth bit must be written to the TXB8 bit in UCSRnB before the low byte of the character is written to UDRn. The following code examples show a transmit function that handles 9-bit characters. For the assembly code, the data to be sent is assumed to be stored in registers R17:R16 before Read Microcontroller atmega2560 flash.
The ninth bit can be used for indicating an address frame when using multi processor communication mode or for other protocol handling as for example synchronization.
