Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
975
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
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 programmed to set, clear or toggle the
output as defined in the corresponding parameter in TC_CMR.
controls TIOA and RB compare controls TIOB. Each of these events can be programmed to set, clear or toggle the
output as defined in the corresponding parameter in TC_CMR.
39.6.16 Quadrature Decoder Logic
39.6.16.1 Description
The quadrature decoder logic is driven by TIOA0, TIOB0, TIOB1 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 measurement requirements (refer to
0 and 1. Channel 2 can be used as a time base in case of speed measurement requirements (refer to
When writing a 0 to bit QDEN of the TC_BMR, the quadrature decoder logic is totally transparent.
TIOA0 and TIOB0 are to be driven by the two dedicated quadrature signals from a rotary sensor mounted on the
shaft of the off-chip motor.
shaft of the off-chip motor.
A third signal from the rotary sensor can be processed through pin TIOB1 and is typically dedicated 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.
an index signal if it is provided by the sensor. This signal is not required to decode the quadrature signals PHA,
PHB.
Field TCCLKS of TC_CMRx must be configured to select XC0 input (i.e., 0x101). Field TC0XC0S has no effect as
soon as quadrature decoder is enabled.
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 accumulates 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.
input signals giving a high accuracy on motor position whereas channel 1 accumulates 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.
phase definition and other factors are configurable.
Interruptions can be generated on different events.
A compare function (using TC_RC) is available on channel 0 (speed/position) or channel 1 (rotation) and can
generate an interrupt by means of the CPCS flag in the TC_SRx.
generate an interrupt by means of the CPCS flag in the TC_SRx.