SAM3N4A Atmel Corporation, SAM3N4A Datasheet - Page 193
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SAM3N4A
Manufacturer Part Number
SAM3N4A
Description
Manufacturer
Atmel Corporation
Specifications of SAM3N4A
Flash (kbytes)
256 Kbytes
Pin Count
48
Max. Operating Frequency
48 MHz
Cpu
Cortex-M3
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
79
Ext Interrupts
79
Quadrature Decoder Channels
2
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
2
Uart
3
Ssc
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)
24
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)
1.62 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
6
Output Compare Channels
6
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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10.22.2
• RELOAD
Value to load into the VAL register when the counter is enabled and when it reaches 0, see
value”
10.22.2.1
11011A–ATARM–04-Oct-10
31
23
15
.
7
SysTick Reload Value Register
Calculating the RELOAD value
30
22
14
6
The LOAD register specifies the start value to load into the VAL register. See the register sum-
mary in
The RELOAD value can be any value in the range 0x00000001-0x00FFFFFF. A start value of 0
is possible, but has no effect because the SysTick exception request and COUNTFLAG are acti-
vated when counting from 1 to 0.
The RELOAD value is calculated according to its use:
• To generate a multi-shot timer with a period of N processor clock cycles, use a RELOAD
• To deliver a single SysTick interrupt after a delay of N processor clock cycles, use a RELOAD
value of N-1. For example, if the SysTick interrupt is required every 100 clock pulses, set
RELOAD to 99.
of value N. For example, if a SysTick interrupt is required after 400 clock pulses, set RELOAD
to 400.
Table 10-33 on page 191
29
21
13
5
28
20
12
4
-RELOAD
Reserved
RELOAD
RELOAD
for its attributes. The bit assignments are:
27
19
11
3
26
18
10
2
“Calculating the RELOAD
25
17
9
1
SAM3N
24
16
8
0
193
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