ATmega324P datasheet(193/377 Pages) ATMEL

193 / 377 page

193

7674F–AVR–09/09

ATmega164P/324P/644P

Note:

1. See “USART in SPI Mode” on page 199 for full description of the Master SPI Mode (MSPIM)

operation

• Bits 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 UPMn 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.

Synchronous USART

(Reserved)

Master SPI (MSPIM)(1)

Table 17-5.

UPMn Bits Settings

UPMn1

UPMn0

Parity Mode

Disabled

Reserved

Enabled, Even Parity

Enabled, Odd Parity

Table 17-6.

USBS Bit Settings

USBSn

Stop Bit(s)

01-bit

12-bit

Table 17-7.

UCSZn Bits Settings

UCSZn2

UCSZn1

UCSZn0

Character Size

000

5-bit

001

6-bit

010

7-bit

011

8-bit

100

Reserved

Table 17-4.

UMSELn Bits Settings

UMSELn1

UMSELn0

Mode

ATmega324P Datasheet(PDF) 193 Page - ATMEL Corporation

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