AT32UC3B1256-Z1UR Atmel, AT32UC3B1256-Z1UR Datasheet - Page 72

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

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: -

10. Real Time Counter (RTC)
10.1
10.2
10.3
Figure 10-1. Real Time Counter Block Diagram
10.4
32059J–12/2010
Features
Overview
Block Diagram
Product Dependencies
CLK_32
RCSYS
CLK32
1
0
CTRL
Rev: 2.3.1.1
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The Real Time Counter (RTC) enables periodic interrupts at long intervals, or accurate mea-
surement of real-time sequences. The RTC is fed from a 16-bit prescaler, which is clocked from
the system RC oscillator or the 32KHz crystal oscillator. Any tapping of the prescaler can be
selected as clock source for the RTC, enabling both high resolution and long timeouts. The pres-
caler cannot be written directly, but can be cleared by the user.
The RTC can generate an interrupt when the counter wraps around the value stored in the top
register (TOP), producing accurate periodic interrupts.
In order to use this module, other parts of the system must be configured correctly, as described
below.
32-bit real-time counter with 16-bit prescaler
Clocked from RC oscillator or 32KHz oscillator
Long delays
High resolution: Max count frequency 16KHz
Extremely low power consumption
Available in all sleep modes except Static
Interrupt on wrap
16-bit Prescaler
EN
– Max timeout 272years
PSEL
32-bit counter
TOP
VAL
TOPI
AT32UC3B
IRQ
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