SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 107

• 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 17-2. Raising the Backup Power Supply
17.3.4.2
6257A–ATARM–20-Feb-08
Zero-Power Power-On
Backup Power Supply
Reset Cell output
RC Oscillator output
vddcore_nreset
vr_standby
NRSTB Asynchronous Reset Pin
supply_on
sram_on
FWUP
vr_ok
Reading FWUPS to 0 means SUPC_SR has already been read since the power up of the
backup power supply and thus, it is not necessary to initialize the Supply Controller.
The NRSTB pin is an asynchronous reset input, which acts exactly like the zero-power power-on
reset cell.
As soon as NRSTB is tied to GND, the supply controller is reset and all the system parts are
powered off.
When NRSTB is released, the system can start as described in
Backup Power
Supply”.
30 Slow Clock Cycles = about 1ms
AT91SAM7L128/64 Preliminary
at least 1 Slow Clock Cycle
Section 17.3.4.1 ”Raising the
107