AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 94

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

16.4.3
Register Name:
Access Type:
• WDUNF: Watchdog Underflow
0: No Watchdog underflow occurred since the last read of WDT_SR.
1: At least one Watchdog underflow occurred since the last read of WDT_SR.
• WDERR: Watchdog Error
0: No Watchdog error occurred since the last read of WDT_SR.
1: At least one Watchdog error occurred since the last read of WDT_SR.
Note:The WDD and WDV values must not be modified within a period of time of 3 slow clock periods following a restart of
the watchdog performed by means of a write access in the WDT_CR register, else the watchdog may trigger an end of
period earlier than expected.
31
23
15
–
–
–
7
–
Watchdog Timer Status Register
30
22
14
WDT_SR
–
–
–
6
–
Read-only
29
21
13
–
–
–
5
–
28
20
12
–
–
–
4
–
27
19
11
–
–
–
3
–
26
18
10
–
–
–
2
–
SAM7S Series [DATASHEET]
WDERR
6175M–ATARM–26-Oct-12
25
17
–
–
9
–
1
WDUNF
24
16
–
–
8
–
0
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