SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 173

• 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

21. AT91SAM Boot Program
21.1
21.2
21.3
6257A–ATARM–20-Feb-08
Overview
Flow Diagram
Device Initialization
The Boot Program integrates different programs permitting download and/or upload into the dif-
ferent memories of the product.
SAM-BA
1 is set to 0.
Once running, SAM-BA
quency, then it waits for transactions on the DBGU serial port.
The Boot Program implements the algorithm in
Figure 21-1. Boot Program Algorithm Flow Diagram
Initialization follows the steps described below:
1. FIQ initialization
1. Stack setup for ARM supervisor mode
2. Setup the Embedded Flash Controller
3. PLL setup: PLL is initialized to generate a 30 MHz typical frequency
4. Switch Master Clock on PLL Clock divided by 2 (15 MHz MCK frequency)
5. Copy code into SRAM
6. C variable initialization
7. Disable of the Watchdog and enable of the user reset
8. Jump to SAM-BA Boot sequence (see
®
Boot is executed at power-up only, if the device exits OFF mode and if the GPNVM bit
Device
Setup
™
Boot first initializes the Debug Unit serial port (DBGU) and the PLL fre-
No
AT91SAM7L128/64 Preliminary
Sequence Successful ?
AutoBaudrate
“SAM-BA Boot”
Figure
21-1.
Yes
)
Run SAM-BA Boot
173