Datasheet

779
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
clock divider. This feature is only available when using USART normal mode. The fractional Baud Rate is
calculated using the following formula:
The modified architecture is presented below:
Figure 35-4. Fractional Baud Rate Generator
35.7.1.3 Baud Rate in Synchronous Mode or SPI Mode
If the USART is programmed to operate in synchronous mode, the selected clock is simply divided by the field CD
in US_BRGR.
In synchronous mode, if the external clock is selected (USCLKS = 3), the clock is provided directly by the signal on
the USART SCK pin. No division is active. The value written in US_BRGR has no effect. The external clock
frequency must be at least 3 times lower than the system clock. In synchronous mode master (USCLKS = 0 or 1,
CLK0 set to 1), the receive part limits the SCK maximum frequency to MCK/3 in USART mode, or MCK/6 in SPI
mode.
When either the external clock SCK or the internal clock divided (MCK/DIV) is selected, the value programmed in
CD must be even if the user has to ensure a 50:50 mark/space ratio on the SCK pin. If the internal clock MCK is
selected, the Baud Rate Generator ensures a 50:50 duty cycle on the SCK pin, even if the value programmed in
CD is odd.
Baudrate
SelectedClock
82 Over–()CD
FP
8
-------
+




----------------------------------------------------------------
=
MCK/DIV
16-bit Counter
0
Baud Rate
Clock
CD
CD
Sampling
Divider
0
1
>1
Sampling
Clock
Reserved
MCK
SCK
USCLKS
OVER
SCK
SYNC
SYNC
USCLKS = 3
1
0
2
3
0
1
0
1
FIDI
glitch-free
logic
Modulus
Control
FP
FP
BaudRate
SelectedClock
CD
--------------------------------------
=