SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 107
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 17-2. 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
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