Match the ppp frame field to the description.

MATCH THE PPP FRAME FIELD TO THE DESCRIPTION. SERIAL
MATCH THE PPP FRAME FIELD TO THE DESCRIPTION. CODE

The baud rate is given as a function parameter. The examples assume asynchronous operation using polling (no interrupts enabled) and a fixed frame format.

MATCH THE PPP FRAME FIELD TO THE DESCRIPTION. CODE

The following simple USART initialization code examples show one assembly and one C function that are equal in functionality. Note that the TXC Flag must be cleared before each transmission (before UDR is written) if it is used for this purpose. The TXC Flag can be used to check that the Transmitter has completed all transfers, and the RXC Flag can be used to check that there are no unread data in the receive buffer. For interrupt driven USART operation, the Global Interrupt Flag should be cleared (and interrupts globally disabled) when doing the initialization.Р вЂќР’В«efore doing a re-initialization with changed baud rate or frame format, be sure that there are no ongoing transmissions during the period the registers are changed. The initialization process normally consists of setting the baud rate, setting frame format and enabling the Transmitter or the Receiver depending on the usage. The USART has to be initialized before any communication can take place.

MATCH THE PPP FRAME FIELD TO THE DESCRIPTION. SERIAL

If used, the parity bit is located between the last data bit and first stop bit of a serial frame. The relation between the parity bit and data bits is as If odd parity is used, the result of the exclusive or is inverted. The parity bit is calculated by doing an exclusive-or of all the data bits. An FE (Frame Error) will therefore only be detected in the cases where the first stop bit is zero. The receiver ignores the second stop bit. The selection between one or two stop bits is done by the USART Stop Bit Select (USBS) bit. The USART Parity mode (UPM1:0) bits enable and set the type of parity bit. The USART Character SiZe (UCSZ2:0) bits select the number of data bits in the frame. Note that changing the setting of any of these bits will corrupt all ongoing communication for both the Receiver and Transmitter. The Receiver and Transmitter use the same setting. The frame format used by the USART is set by the UCSZ2:0, UPM1:0, and USBS bits in UCSRB and UCSRC. IDLE No transfers on the communication line (RxD or TxD).

Two-wire Serial Interface Characteristics.

Simple Assembly Code Example for a Boot Loader.

Prevent Reading the RWW Section during Self-Programming.

Read-While-Write and no Read- While-Write Flash Sections.

Changing Channel or Reference Selection.

8-bit Timer/Counter2 with PWM and Asynchronous Operation.

16-bit Timer/Counter Register Description.

Timer/Counter0 and Timer/Counter1 Prescalers.

8-bit Timer/Counter Register Description.

Match the ppp frame field to the description.