ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 49

• Manufacturer Part Number: ATmega406
• Manufacturer: Atmel Corporation

Specifications of ATmega406

• Flash (kbytes): 40 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 1 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -30 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 2
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

10. Wake-up Timer
10.1
10.2
10.2.1
2548E–AVR–07/06
Overview
Register Description
WUTCSR – Wake-up Timer Control and Status Register
The following section describes the Wake-up Timer in the ATmega406.
•
•
•
•
The Wake-up Timer is clocked either from the Slow RC Oscillator or from the external 32 kHz
crystal oscillator. See
Wake-up Timer prescaler, the Wake-up interval can be adjusted from 31.25 ms to 4 s. Eight dif-
ferent clock cycle periods can be selected to determine the Time-out period.
Figure 10-1. Wake-up Timer
• Bit 7 – WUTIF: Wake-up Timer Interrupt Flag
The WUTIF bit is set (one) when an overflow occurs in the Wake-up Timer. WUTIF is cleared by
hardware when executing the corresponding interrupt handling vector. Alternatively, WUTIF is
cleared by writing a logic one to the flag. When the SREG I-bit, WUTIE (Wake-up Timer Interrupt
Enable), and WUTIF are set (one), the Wake-up Timer interrupt is executed.
Bit
(0x62)
Read/Write
Initial Value
One Wake-up Timer Interrupt
8 Selectable Time-out Periods
Separate Wake-up Timer Calibration Flag
Separate Clock Source
WUTIF
R/W
OSCILLATOR
7
0
OSCILLATOR
SLOW RC
32 kHz
”Run-Time Clock Source Select” on page 28
WUTR
WUTP0
WUTP1
WUTP2
WUTE
WUTIE
R/W
6
0
WUTCF
1/4
R/W
5
0
WUTR
R/W
clk
4
0
WUT
WUTE
R/W
3
0
PRESCALER
WAKE-UP
WUTIF
WUTP2
R/W
2
0
for details. By controlling the
WUTP1
R/W
1
0
ATmega406
WUTCF
WUTP0
R/W
0
0
WUTCSR
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