ATmega325P datasheet(185/364 Pages) ATMEL

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8023F–AVR–07/09

ATmega325P/3250P

• Bit 5:4 – UPMn1:0: Parity Mode

These bits enable and set type of parity generation and check. If enabled, the Transmitter will

automatically generate and send the parity of the transmitted data bits within each frame. The

Receiver will generate a parity value for the incoming data and compare it to the UPMn0 setting.

If a mismatch is detected, the UPEn Flag in UCSRnA will be set.

• Bit 3 – USBSn: Stop Bit Select

This bit selects the number of stop bits to be inserted by the Transmitter. The Receiver ignores

this setting.

• Bit 2:1 – UCSZn1:0: Character Size

The UCSZn1:0 bits combined with the UCSZn2 bit in UCSRnB sets the number of data bits

(Character SiZe) in a frame the Receiver and Transmitter use.

• Bit 0 – UCPOLn: Clock Polarity

This bit is used for synchronous mode only. Write this bit to zero when asynchronous mode is

used. The UCPOLn bit sets the relationship between data output change and data input sample,

and the synchronous clock (XCK).

Figure 18-10. UPMn Bits Settings

UPMn1

UPMn0

Parity Mode

Disabled

Reserved

Enabled, Even Parity

Enabled, Odd Parity

Figure 18-11. USBSn Bit Settings

USBSn

Stop Bit(s)

01-bit

12-bit

Figure 18-12. UCSZ Bits Settings

UCSZn2

UCSZn1

UCSZn0

Character Size

5-bit

6-bit

7-bit

8-bit

100

Reserved

101

Reserved

110

Reserved

9-bit

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