SAM4S16C Atmel Corporation, SAM4S16C Datasheet - Page 105
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SAM4S16C
Manufacturer Part Number
SAM4S16C
Description
Manufacturer
Atmel Corporation
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
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11.6.4.9
11100A–ATARM–28-Oct-11
11100A–ATARM–28-Oct-11
CLREX
Condition Flags
These instructions do not change the flags.
Examples
Clear Exclusive.
Syntax
where:
cond
Operation
Use CLREX to make the next STREX, STREXB, or STREXH instruction write 1 to its destination
register and fail to perform the store. It is useful in exception handler code to force the failure of
the store exclusive if the exception occurs between a load exclusive instruction and the match-
ing store exclusive instruction in a synchronization operation.
See
Condition Flags
These instructions do not change the flags.
Examples
try
CLREX{cond}
CLREX
“Synchronization Primitives”
MOV
LDREX
CMP
ITT
STREXEQ R0, R1, [LockAddr]
CMPEQ
BNE
....
is an optional condition code, see
R1, #0x1
R0, [LockAddr]
R0, #0
EQ
R0, #0
try
for more information.
; Initialize the ‘lock taken’ value
; Load the lock value
; Is the lock free?
; IT instruction for STREXEQ and CMPEQ
; Try and claim the lock
; Did this succeed?
; No – try again
; Yes – we have the lock
“Conditional Execution”
.
SAM4S
SAM4S
105
105
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