ATMEGA32_06 Datasheet, PDF (142/347 Pages) ATMEL Corporation – 8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash

Figure 70. Clock Generation Logic, Block Diagram
UBRR
fosc
Prescaling
Down-Counter
UBRR+1
/2
/4
OSC
XCK
Pin
xcki
xcko
Sync
Register
Edge
Detector
DDR_XCK
UCPOL
U2X
/2
0
1
DDR_XCK
0
txclk
1
0
UMSEL
1
1
rxclk
0
Internal Clock Generation –
The Baud Rate Generator
Signal description:
txclk Transmitter clock (Internal Signal).
rxclk Receiver base clock (Internal Signal).
xcki Input from XCK pin (Internal Signal). Used for synchronous slave operation.
xcko Clock output to XCK pin (Internal Signal). Used for synchronous master
operation.
fosc XTAL pin frequency (System Clock).
Internal clock generation is used for the asynchronous and the synchronous master
modes of operation. The description in this section refers to Figure 70.
The USART Baud Rate Register (UBRR) and the down-counter connected to it function
as a programmable prescaler or baud rate generator. The down-counter, running at sys-
tem clock (fosc), is loaded with the UBRR value each time the counter has counted
down to zero or when the UBRRL Register is written. A clock is generated each time the
counter reaches zero. This clock is the baud rate generator clock output (=
fosc/(UBRR+1)). The Transmitter divides the baud rate generator clock output by 2, 8 or
16 depending on mode. The baud rate generator output is used directly by the receiver’s
clock and data recovery units. However, the recovery units use a state machine that
uses 2, 8 or 16 states depending on mode set by the state of the UMSEL, U2X and
DDR_XCK bits.
Table 60 contains equations for calculating the baud rate (in bits per second) and for
calculating the UBRR value for each mode of operation using an internally generated
clock source.
142 ATmega32(L)
2503J–AVR–10/06