ATSAM3S4CA-AU Atmel, ATSAM3S4CA-AU Datasheet - Page 1020

• Manufacturer Part Number: ATSAM3S4CA-AU
• Description: IC MCU 32BIT 256KB FLASH 100LQFP
• Manufacturer: Atmel
• Series: SAM3Sr

Specifications of ATSAM3S4CA-AU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 64MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 79
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.62 V ~ 1.95 V
• Data Converters: A/D 16x10/12b, D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Controller Family/series: ATSAM3S
• No. Of I/o's: 79
• Ram Memory Size: 48KB
• Cpu Speed: 64MHz
• No. Of Timers: 6
• Rohs Compliant: Yes
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3S-EK
• Cpu Family: AT91
• Device Core: ARM Cortex-M3
• Device Core Size: 32b
• Frequency (max): 64MHz
• Total Internal Ram Size: 48KB
• # I/os (max): 79
• Number Of Timers - General Purpose: 6
• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Supply Voltage (max): 1.95/3.6V
• Operating Supply Voltage (min): 1.62V
• On-chip Adc: 16-chx12-bit
• On-chip Dac: 2-chx12-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 100
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

40.6.8
Write Protection Registers
In order to provide security to the DACC, a write protection system has been implemented.
The write protection mode prevents the writing of certain registers. When this mode is enabled and one of
the protected registers is written, an error is generated in the
DACC Write Protect Status Register
and the
register write request is canceled. When a write protection error occurs, the WPROTERR flag is set and the
address of the corresponding canceled register write is available in the WPROTADRR field of the
DACC
Write Protect Status
Register.
Due to the nature of the write protection feature, enabling and disabling the write protection mode requires
the use of a security code. Thus when enabling or disabling the write protection mode the WPKEY field of
the
DACC Write Protect Mode Register
must be filled with the “DAC” ASCII code (corresponding to
0x444143) otherwise the register write is canceled.
The protected registers are:
DACC Mode Register
DACC Channel Enable Register
DACC Channel Disable Register
DACC Analog Current Register
SAM3S Preliminary
1020
6500C–ATARM–8-Feb-11