SAM7X256 Atmel Corporation, SAM7X256 Datasheet - Page 177

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SAM7X256

Manufacturer Part Number
SAM7X256
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of SAM7X256

Flash (kbytes)
256 Kbytes
Pin Count
100
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
62
Ext Interrupts
62
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
3
Can
1
Ssc
1
Ethernet
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
64
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.3
Operating Voltage (vcc)
3.0 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
24. Clock Generator
24.1
24.2
24.3
24.3.1
6120I–ATARM–06-Apr-11
Overview
Slow Clock RC Oscillator
Main Oscillator
Main Oscillator Connections
The Clock Generator is made up of 1 PLL, a Main Oscillator, as well as an RC Oscillator .
It provides the following clocks:
The Clock Generator User Interface is embedded within the Power Management Controller one
and is described in
The user has to take into account the possible drifts of the RC Oscillator. More details are given
in the section “DC Characteristics” of the product datasheet.
Figure 24-1
Figure 24-1. Main Oscillator Block Diagram
The Clock Generator integrates a Main Oscillator that is designed for a
crystal. The typical crystal connection is illustrated in
trical characteristics of the Main Oscillator, see the section “DC Characteristics” of the product
datasheet.
• SLCK, the Slow Clock, which is the only permanent clock within the system
• MAINCK is the output of the Main Oscillator
• PLLCK is the output of the Divider and PLL block
shows the Main Oscillator block diagram.
Slow Clock
Section
XOUT
SLCK
XIN
25.9. However, the Clock Generator registers are named CKGR_.
Main Clock
OSCOUNT
Frequency
Oscillator
MOSCEN
Oscillator
Counter
Counter
Main
Main
Figure
SAM7X512/256/128
24-2. For further details on the elec-
Main Clock
MAINCK
MAINRDY
MOSCS
MAINF
3 to 20
MHz fundamental
177

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