SAM3S1B Atmel Corporation, SAM3S1B Datasheet - Page 123

• Manufacturer Part Number: SAM3S1B
• Manufacturer: Atmel Corporation

Specifications of SAM3S1B

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 64 MHz
• Cpu: Cortex-M3
• # Of Touch Channels: 23
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Quadrature Decoder Channels: 1
• 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: 10
• 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): 16
• Self Program Memory: YES
• 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: 3
• Output Compare Channels: 3
• 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
6500C–ATARM–8-Feb-11
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
n−1
n
, the result returned is −2
−1, the result returned is 2
“Conditional execution” on page
−1, the result returned is 2
“MRS” on page
n-1
n
−1
“MSR” on page
n-1
143.
−1
84.
SAM3S
144.
n
123
−1.