AT91SAM7S256C-MU Atmel, AT91SAM7S256C-MU Datasheet - Page 623

• Manufacturer Part Number: AT91SAM7S256C-MU
• Description: IC ARM7 MCU 32BIT 256K 64-QFN
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S256C-MU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Processor Series: AT91
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 64 KB
• Interface Type: SPI, TWI, USART, USB
• Maximum Clock Frequency: 55 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 5
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT91SAM7S256-MU; AT91SAM7S256-MU

40.6.14.2
6175K–ATARM–30-Aug-10
WDT: The Watchdog Timer Status Register and Interrupt
the user restarts the watchdog (WDDRSTT). The only way to recover from this state is a power-
on reset. The issue depends on the values of WDD and WDV in the WDT_MR register.
Two workarounds are possible.
Under certain rare circumstances, if the Watchdog Timer is used with the Watchdog Fault Inter-
rupt enabled (WDFIEN set at 1), the Watchdog Timer may trigger the interrupt (wdt_fault)
erroneously. The Watchdog Timer Status Register may be wrong also (WDERR and WDUNF).
The issue depends on the values of WDD and WDV in the WDT_MR register.
Two workarounds are possible.
1. Either do not use the Watchdog Timer with the Watchdog Reset enabled (WDRSTEN
2. or set WDD to 0xFFF and in addition use only one of the following values for WDV:
1. Either do not us the Watchdog Timer with the Watchdog fault Interrupt enabled
2. or set WDD to 0xFFF and in addition use only one of the following values for WDV:
Problem Fix/Workaround
Problem Fix/Workaround
set at 1),
0xFFF, 0xDFF, 0xBFF, 0x9FF, 0x7FF, 0x77F, 0x6FF, 0x67F, 0x5FF, 0x57F, 0x4FF,
0x47F, 0x3FF, 0x37F, 0x2FF, 0x27F, 0x1FF, 0x1BF, 0x17F, 0x13F, 0x0FF, 0x0DF, 0x0BF,
0x09F, 0x07F, 0x06F, 0x05F, 0x04F, 0x03F, 0x037, 0x02f, 0x027, 0x01F, 0x01B, 0x017,
0x013 and 0x00F.
(WDFIEN set at 1),
0xFFF, 0xDFF, 0xBFF, 0x9FF, 0x7FF, 0x77F, 0x6FF, 0x67F, 0x5FF, 0x57F, 0x4FF,
0x47F, 0x3FF, 0x37F, 0x2FF, 0x27F, 0x1FF, 0x1BF, 0x17F, 0x13F, 0x0FF, 0x0DF, 0x0BF,
0x09F, 0x07F, 0x06F, 0x05F, 0x04F, 0x03F, 0x037, 0x02f, 0x027, 0x01F, 0x01B, 0x017,
0x013 and 0x00F.
AT91SAM7S Series Preliminary
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