Rainbow-electronics ATmega32L Manuel d'utilisateur télécharger pdf (Page 143)

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ATmega32(L)

2503C–AVR–10/02

The USART Character SiZe (UCSZ2:0) bits select the number of data bits in the frame.

The USART Parity mode (UPM1:0) bits enable and set the type of parity bit. The selec-

tion between one or two stop bits is done by the USART Stop Bit Select (USBS) bit. The

receiver ignores the second stop bit. An FE (Frame Error) will therefore only be detected

in the cases where the first stop bit is zero.

Parity Bit Calculation The parity bit is calculated by doing an exclusive-or of all the data bits. If odd parity is

used, the result of the exclusive or is inverted. The relation between the parity bit and

data bits is as follows::

even

Parity bit using even parity

odd

Parity bit using odd parity

Data bit n of the character

If used, the parity bit is located between the last data bit and first stop bit of a serial

frame.

even

n 1–

… d

odd

⊕⊕⊕⊕⊕⊕

n 1–

… d

1⊕⊕⊕⊕⊕⊕

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 312 313

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Rainbow-electronics ATmega32L Manuel d'utilisateur Page 143

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