AT91R40807-33AI Atmel, AT91R40807-33AI Datasheet - Page 93

• Manufacturer Part Number: AT91R40807-33AI
• Description: IC ARM7 MCU 176 TQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91R40807-33AI

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

WD Enabling Sequence
1354D–ATARM–08/02
To enable the Watchdog Timer the sequence is as follows:
1. Disable the Watchdog by clearing the bit WDEN:
2. Initialize the WD Clock Mode Register:
3. Restart the timer:
4. Enable the watchdog:
Write 0x2340 to WD_OMR
This step is unnecessary if the WD is already disabled (reset state).
Write 0x373C to WD_CMR
(HPCV = 15 and WDCLKS = MCK/8)
Write 0xC071 to WD_CR
Write 0x2345 to WD_OMR (interrupt enabled)
AT91X40 Series
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