SAM3S4B Atmel Corporation, SAM3S4B Datasheet - Page 466

• Manufacturer Part Number: SAM3S4B
• Manufacturer: Atmel Corporation

Specifications of SAM3S4B

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 64 MHz
• Cpu: Cortex-M3
• # Of Touch Channels: 23
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 79
• Ext Interrupts: 79
• Usb Transceiver: 1
• Quadrature Decoder Channels: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 10
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1000
• Analog Comparators: 1
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 48
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.16.21 PMC Write Protect Mode Register
Name:
Address:
Access:
Reset:
• WPEN: Write Protect Enable
0 = Disables the Write Protect if WPKEY corresponds to 0x504D43 (“PMC” in ASCII).
1 = Enables the Write Protect if WPKEY corresponds to 0x504D43 (“PMC” in ASCII).
Protects the registers:
• WPKEY: Write Protect KEY
Should be written at value 0x504D43 (“PMC” in ASCII). Writing any other value in this field aborts the write operation of the
WPEN bit. Always reads as 0.
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“PMC System Clock Enable Register” on page 444
“PMC System Clock Disable Register” on page 445
“PMC Peripheral Clock Enable Register 0” on page 447
“PMC Peripheral Clock Disable Register 0” on page 448
“PMC Clock Generator Main Oscillator Register” on page 450
“PMC Clock Generator PLLA Register” on page 453
“PMC Clock Generator PLLB Register” on page 454
“PMC Master Clock Register” on page 455
“PMC USB Clock Register” on page 456
“PMC Programmable Clock Register” on page 457
“PMC Fast Startup Mode Register” on page 463
“PMC Fast Startup Polarity Register” on page 464
“PMC Peripheral Clock Enable Register 1” on page 468
“PMC Peripheral Clock Disable Register 1” on page 469
“PMC Oscillator Calibration Register” on page 471
31
23
15
—
7
SAM3S
PMC_WPMR
0x400E04E4
Read-write
See
Table 26-3
30
22
14
—
6
29
21
13
—
5
28
20
12
—
4
WPKEY
WPKEY
WPKEY
27
19
11
—
3
26
18
10
—
2
25
17
—
9
1
6500C–ATARM–8-Feb-11
WPEN
24
16
8
0