AT32UC3B1256-Z1UR Atmel, AT32UC3B1256-Z1UR Datasheet - Page 40

MCU AVR32 256K FLASH 48-QFN

AT32UC3B1256-Z1UR

Manufacturer Part Number
AT32UC3B1256-Z1UR
Description
MCU AVR32 256K FLASH 48-QFN
Manufacturer
Atmel
Series
AVR®32 UC3r
Datasheet

Specifications of AT32UC3B1256-Z1UR

Package / Case
48-QFN Exposed Pad
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Operating Temperature
-40°C ~ 85°C
Speed
60MHz
Number Of I /o
28
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
32K x 8
Program Memory Size
256KB (256K x 8)
Data Converters
A/D 6x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Connectivity
I²C, IrDA, SPI, SSC, UART/USART, USB
Core Size
32-Bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
9.5.5.1
9.5.5.2
32059J–12/2010
PLL0 clock
Osc0 clock
Slow clock
Selecting PLL or oscillator for the main clock
Selecting synchronous clock division ratio
MCSEL
any tapping of this prescaler, or the undivided main clock, as long as f
nous clock source can be changed on-the fly, responding to varying load in the application. The
clock domains can be shut down in sleep mode, as described in
Additionally, the clocks for each module in the four domains can be individually masked, to avoid
power consumption in inactive modules.
Figure 9-4.
The common main clock can be connected to the slow clock, Oscillator 0, or PLL0. By default,
the main clock will be connected to the slow clock. The user can connect the main clock to Oscil-
lator 0 or PLL0 by writing the MCSEL bitfield in the Main Clock Control Register (MCCTRL). This
must only be done after that unit has been enabled, otherwise a deadlock will occur. Care
should also be taken that the new frequency of the synchronous clocks does not exceed the
maximum frequency for each clock domain.
The main clock feeds an 8-bit prescaler, which can be used to generate the synchronous clocks.
By default, the synchronous clocks run on the undivided main clock. The user can select a pres-
caler division for the CPU clock by writing CKSEL:CPUDIV to 1 and CPUSEL to the prescaling
value, resulting in a CPU clock frequency:
f
CPU
Prescaler
= f
instruction
main
Synchronous clock generation
Sleep
/ 2
(CPUSEL+1)
CPUSEL
CPUDIV
0
1
Controller
Main clock
Sleep
CPUMASK
Mask
”Sleep modes” on page
CPU
AT32UC3B
f
PBA,B,
CPU clocks
HSB clocks
PBB clocks
PBAclocks
. The synchro-
42.
40

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