SAM4S16C Atmel Corporation, SAM4S16C Datasheet - Page 783

• Manufacturer Part Number: SAM4S16C
• 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

33.5.2.3
Figure 33-5. Receiver Ready
33.5.2.4
11100A–ATARM–28-Oct-11
11100A–ATARM–28-Oct-11
RXRDY
URXD
S
Receiver Ready
Receiver Overrun
D0
D1
D2
Figure 33-3. Start Bit Detection
Figure 33-4. Character Reception
When a complete character is received, it is transferred to the UART_RHR and the RXRDY sta-
tus bit in UART_SR (Status Register) is set. The bit RXRDY is automatically cleared when the
receive holding register UART_RHR is read.
If UART_RHR has not been read by the software (or the Peripheral Data Controller or DMA
Controller) since the last transfer, the RXRDY bit is still set and a new character is received, the
OVRE status bit in UART_SR is set. OVRE is cleared when the software writes the control regis-
ter UART_CR with the bit RSTSTA (Reset Status) at 1.
Sampling Clock
Baud Rate
D3
Example: 8-bit, parity enabled 1 stop
Sampling
URXD
Clock
URXD
D4
D5
0.5 bit
period
True Start Detection
D6
period
1 bit
D7
D0
P
D1
True Start
Detection
S
D2
Read UART_RHR
D0
D3
D1
D4
D2
D3
D5
D4
D6
D5
D7
D6
Parity Bit
D7
SAM4S
SAM4S
P
D0
Stop Bit
783
783