ATSAM3X4EA-AU Atmel, ATSAM3X4EA-AU Datasheet - Page 612

• Manufacturer Part Number: ATSAM3X4EA-AU
• Description: ARM Microcontrollers - MCU QFP144,GREEN, IND TEMP, MRL A
• Manufacturer: Atmel

Specifications of ATSAM3X4EA-AU

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: SAM3X
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 84 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 3.6 V
• Operating Temperature Range: - 40 C to +85 C
• Package / Case: LQFP-144
• Mounting Style: SMD/SMT
• Factory Pack Quantity: 60

31.8.1
612
612
SAM3X/A
SAM3X/A
Write Protection Registers
To prevent any single software error that may corrupt SSC behavior, certain address spaces can
be write-protected by setting the WPEN bit in the
(SSC_WPMR).
If a write access to the protected registers is detected, then the WPVS flag in the SSC Write Pro-
tect Status Register (US_WPSR) is set and the field WPVSRC indicates in which register the
write access has been attempted.
The WPVS flag is reset by writing the SSC Write Protect Mode Register (SSC_WPMR) with the
appropriate access key, WPKEY.
The protected registers are:
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•
•
•
•
•
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“SSC Clock Mode Register” on page 615
“SSC Receive Clock Mode Register” on page 616
“SSC Receive Frame Mode Register” on page 618
“SSC Transmit Clock Mode Register” on page 620
“SSC Transmit Frame Mode Register” on page 622
“SSC Receive Compare 0 Register” on page 628
“SSC Receive Compare 1 Register” on page 629
“SSC Write Protect Mode Register”
11057B–ATARM–28-May-12
11057B–ATARM–28-May-12