SAM9G25 Atmel Corporation, SAM9G25 Datasheet - Page 867

• Manufacturer Part Number: SAM9G25
• Manufacturer: Atmel Corporation

Specifications of SAM9G25

• Flash (kbytes): 0 Kbytes
• Pin Count: 247
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR2/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

39.7.10
11032A–ATARM–27-Jul-11
11032A–ATARM–27-Jul-11
Write Protection Registers
Figure 39-57. Remote Loopback Mode Configuration
To prevent any single software error that may corrupt USART behavior, certain address spaces
can be write-protected by setting the WPEN bit in the USART Write Protect Mode Register
(US_WPMR).
If a write access to the protected registers is detected, then the WPVS flag in the USART Write
Protect 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 USART Write Protect Mode Register (US_WPMR) with
the appropriate access key, WPKEY.
The protected registers are:
•
•
•
•
•
•
•
“USART Mode Register”
“USART Baud Rate Generator Register”
“USART Receiver Time-out Register”
“USART Transmitter Timeguard Register”
“USART FI DI RATIO Register”
“USART IrDA FILTER Register”
“USART Manchester Configuration Register”
Transmitter
Receiver
1
RXD
TXD
SAM9G25
SAM9G25
867
867