ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 87

• Manufacturer Part Number: ATEVK1105
• Description: KIT EVAL FOR AT32UC3A0
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1105

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A0512
• Processor Series: AVR
• Data Bus Width: 32 bit
• Interface Type: USART, TWI, USB, SPI, Ethernet
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A0512
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A0
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.3
Figure 14-1. Real Time Counter module block diagram
14.4
14.4.1
14.4.2
14.4.3
14.4.4
14.5
14.5.1
14.5.1.1
32058J–AVR32–04/11
Block Diagram
RC OSC
Product Dependencies
Functional Description
32 kHz
Power Management
Interrupt
Debug Operation
Clocks
RTC operation
Source clock
CLK32
RTC_CTRL
1
0
The RTC is continuously clocked, and remains operating in all sleep modes except Static. Inter-
rupts are not available in DeepStop mode.
The RTC interrupt line is connected to one of the internal sources of the interrupt controller.
Using the RTC interrupt requires the interrupt controller to be programmed first.
The RTC prescaler is frozen during debug operation, unless the OCD system keeps peripherals
running in debug operation.
The RTC can use the internal RC oscillator as clock source. This oscillator is always enabled
whenever these modules are active. Please refer to the Electrical Characteristics chapter for the
characteristic frequency of this oscillator (f
The RTC can also use the 32 KHz crystal oscillator as clock source. This oscillator must be
enabled before use. Please refer to the Power Manager chapter for details.
The RTC is enabled by writing the EN bit in the CTRL register to 1. The 16-bit prescaler will then
increment on the selected clock. The prescaler cannot be read or written, but it can be reset by
writing the PCLR strobe.
16-bit Prescaler
EN
PCLR
32-bit counter
RTC_TOP
RTC_VAL
RC
).
TOPI
AT32UC3A
IRQ
87