SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 112

• Manufacturer Part Number: SAM7L128
• Manufacturer: Atmel Corporation

Specifications of SAM7L128

• Flash (kbytes): 128 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 36 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 80
• Ext Interrupts: 80
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Segment Lcd: 40
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 460
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 6
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.8 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Figure 17-7. Shutdown of the Backup Power Supply After Writing SHDWEOF at 1
slow_clock
write_shdweof
write_shdweof_slck
lcd_eof
vddcore_nreset
vr_standby
flash_off
flash_poe
VDDCORE
sram_on
lcd_nreset
lcd_pump_on
rt_nreset
rt_on
supply_on
VDDBU
17.3.6.2
Controlling the Voltage Regulator
The Supply Controller can be used to control the embedded 1.8V voltage regulator.
The VRVDD field in the Supply Controller Mode Register, SUPC_MR, allows to select the output
voltage between 1.55V and 1.80V, depending on the performance required by the processor.
The VRDEEP field in the Supply Controller Mode Register, SUPC_MR, allows to switch the volt-
age regulator into deep mode, thus reducing its leakage current to a minimum.
The programmer can switch off the voltage regulator, and thus put the device in Backup Mode,
by writing the Supply Controller Control Register, SUPC_CR, with the VROFF bit at 1. This
asserts the vddcore_nreset signal after the write resynchronization time which lasts, in the worse
AT91SAM7L128/64 Preliminary
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6257A–ATARM–20-Feb-08