SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 112
SAM7L128
Manufacturer Part Number
SAM7L128
Description
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
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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
112
6257A–ATARM–20-Feb-08
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