SAM3N2A Atmel Corporation, SAM3N2A Datasheet - Page 123

• Manufacturer Part Number: SAM3N2A
• Manufacturer: Atmel Corporation

Specifications of SAM3N2A

• Flash (kbytes): 128 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 48 MHz
• Cpu: Cortex-M3
• # Of Touch Channels: 23
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 47
• Ext Interrupts: 47
• 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): 16
• 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

10.15 Saturating instructions
10.15.1
10.15.1.1
10.15.1.2
11011A–ATARM–04-Oct-10
SSAT and USAT
Syntax
Operation
This section describes the saturating instructions, SSAT and USAT.
Signed Saturate and Unsigned Saturate to any bit position, with optional shift before saturating.
where:
op
cond
Rd
n
Rm
shift #s
These instructions saturate to a signed or unsigned n-bit value.
The SSAT instruction applies the specified shift, then saturates to the signed range −
2
The USAT instruction applies the specified shift, then saturates to the unsigned range 0 ≤x ≤2
For signed n-bit saturation using SSAT, this means that:
For unsigned n-bit saturation using USAT, this means that:
If the returned result is different from the value to be saturated, it is called saturation. If satura-
tion occurs, the instruction sets the Q flag to 1 in the APSR. Otherwise, it leaves the Q flag
unchanged. To clear the Q flag to 0, you must use the MSR instruction, see
To read the state of the Q flag, use the MRS instruction, see
n–1
• if the value to be saturated is less than − 2
• if the value to be saturated is greater than 2
• otherwise, the result returned is the same as the value to be saturated.
• if the value to be saturated is less than 0, the result returned is 0
• if the value to be saturated is greater than 2
• otherwise, the result returned is the same as the value to be saturated.
op{cond} Rd, #n, Rm {, shift #s}
≤x ≤2
SSAT
USAT
n ranges from 1 to 32 for SSAT
n ranges from 0 to 31 for USAT.
ASR #s where s is in the range 1 to 31
LSL #s where s is in the range 0 to 31.
n–1
− 1.
is one of:
Saturates a signed value to a signed range.
Saturates a signed value to an unsigned range.
is an optional condition code, see
is the destination register.
specifies the bit position to saturate to:
is the register containing the value to saturate.
is an optional shift applied to Rm before saturating. It must be one of the following:
n− 1
, the result returned is − 2
n− 1
n
− 1, the result returned is 2
“Conditional execution” on page
− 1, the result returned is 2
“MRS” on page
n-1
n
− 1
n-1
“MSR” on page
143.
− 1
84.
SAM3N
144.
123
n
− 1.