SAM4S16C Atmel Corporation, SAM4S16C Datasheet - Page 234

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SAM4S16C

Manufacturer Part Number
SAM4S16C
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of SAM4S16C

Flash (kbytes)
1024 Kbytes
Pin Count
100
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
79
Ext Interrupts
79
Usb Transceiver
1
Quadrature Decoder Channels
2
Usb Speed
Full Speed
Usb Interface
Device
Spi
3
Twi (i2c)
2
Uart
4
Ssc
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
1000
Analog Comparators
1
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
YES
External Bus Interface
1
Dram Memory
No
Nand Interface
Yes
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
Yes / No
Timers
6
Output Compare Channels
6
Input Capture Channels
6
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
11.10.1.1
Name:
Access:
Reset:
The SysTick SYST_CSR register enables the SysTick features.
• COUNTFLAG: Count Flag
Returns 1 if the timer counted to 0 since the last time this was read.
• CLKSOURCE: Clock Source
Indicates the clock source:
0: External Clock.
1: Processor Clock.
• TICKINT
Enables a SysTick exception request:
0: Counting down to zero does not assert the SysTick exception request.
1: Counting down to zero asserts the SysTick exception request.
The software can use COUNTFLAG to determine if SysTick has ever counted to zero.
• ENABLE
Enables the counter:
0: Counter disabled.
1: Counter enabled.
When ENABLE is set to 1, the counter loads the RELOAD value from the SYST_RVR register and then counts down. On
reaching 0, it sets the COUNTFLAG to 1 and optionally asserts the SysTick depending on the value of TICKINT. It then
loads the RELOAD value again, and begins counting.
234
234
23
15
31
7
SAM4S
SAM4S
SysTick Control and Status
SYST_CSR
Read-write
0x000000000
22
14
30
6
21
13
29
5
20
12
28
4
19
11
27
3
CLKSOURCE
26
18
10
2
TICKINT
25
17
9
1
11100A–ATARM–28-Oct-11
11100A–ATARM–28-Oct-11
COUNTFLAG
ENABLE
24
16
8
0

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