ATSAM3U4CA-CU Atmel, ATSAM3U4CA-CU Datasheet - Page 770

• Manufacturer Part Number: ATSAM3U4CA-CU
• Description: IC MCU 32BIT 256KB FLSH 100TFBGA
• Manufacturer: Atmel
• Series: SAM3Ur

Specifications of ATSAM3U4CA-CU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 96MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 57
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 52K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 4x10b, 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• Data Bus Width: 32 bit
• Data Ram Size: 52 KB
• Interface Type: 3xUSART, TWI, 4xSPI, Bus
• Maximum Clock Frequency: 96 MHz
• Number Of Programmable I/os: 57
• Number Of Timers: 8
• Operating Supply Voltage: 1.62 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3U-EK
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

36.6.12
36.6.13
36.6.14
36.6.14.1
770
770
SAM3U Series
SAM3U Series
External Event/Trigger Conditions
Output Controller
Quadrature Decoder Logic
Description
An external event can be programmed to be detected on one of the clock sources (XC0, XC1,
XC2) or TIOB. The external event selected can then be used as a trigger.
The EEVT parameter in TC_CMR selects the external trigger. The EEVTEDG parameter defines
the trigger edge for each of the possible external triggers (rising, falling or both). If EEVTEDG is
cleared (none), no external event is defined.
If TIOB is defined as an external event signal (EEVT = 0), TIOB is no longer used as an output
and the compare register B is not used to generate waveforms and subsequently no IRQs. In
this case the TC channel can only generate a waveform on TIOA.
When an external event is defined, it can be used as a trigger by setting bit ENETRG in
TC_CMR.
As in Capture Mode, the SYNC signal and the software trigger are also available as triggers. RC
Compare can also be used as a trigger depending on the parameter WAVSEL.
The output controller defines the output level changes on TIOA and TIOB following an event.
TIOB control is used only if TIOB is defined as output (not as an external event).
The following events control TIOA and TIOB: software trigger, external event and RC compare.
RA compare controls TIOA and RB compare controls TIOB. Each of these events can be pro-
grammed to set, clear or toggle the output as defined in the corresponding parameter in
TC_CMR.
The quadrature decoder logic is driven by TIOA0, TIOB0, TIOA1 input pins and drives the
timer/counter of channel 0 and 1. Channel 2 can be used as a time base in case of speed mea-
surement requirements (refer to
When writing 0 in the QDEN field of the TC_BMR register, the quadrature decoder logic is totally
transparent.
TIOA0 and TIOB0 are to be driven by the 2 dedicated quadrature signals from a rotary sensor
mounted on the shaft of the off-chip motor.
A third signal from the rotary sensor can be processed through pin TIOA1 and is typically dedi-
cated to be driven by an index signal if it is provided by the sensor. This signal is not required to
decode the quadrature signals PHA, PHB.
TCCLKS field of TC_CMR channels must be configured to select XC0 input (i.e. 0x101).
TC0XC0S field has no effect as soon as quadrature decoder is enabled.
Either speed or position/revolution can be measured. Position channel 0 accumulates the edges
of PHA, PHB input signals giving a high accuracy on motor position whereas channel 1 accumu-
lates the index pulses of the sensor, therefore the number of rotations. Concatenation of both
values provides a high level of precision on motion system position.
In speed mode, position cannot be measured but revolution can be measured.
Inputs from the rotary sensor can be filtered prior to down-stream processing. Accommodation
of input polarity, phase definition and other factors are configurable.
Figure 36.7 ”Timer Counter (TC) User
Interface”).
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11