Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 858

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Each of the 4 channels is composed of six blocks:





A counter clocked by the output of the clock selector. This counter is incremented or decremented according to the 
channel configuration and comparators matches. The size of the counter is 16 bits.



A comparator used to compute the OCx output waveform according to the counter value and the configuration. 
The counter value can be the one of the channel counter or the one of the channel 0 counter according to SYNCx 
bit in the 



A 2-bit configurable gray counter enables the stepper motor driver. One gray counter drives 2 channels.



A dead-time generator providing two complementary outputs (DTOHx/DTOLx) which allows to drive external 
power control switches safely.



An output override block that can force the two complementary outputs to a programmed value (OOOHx/OOOLx).



An asynchronous fault protection mechanism that has the highest priority to override the two complementary 
outputs (PWMHx/PWMLx) in case of fault detection (outputs forced to 0, 1). 

The comparator continuously compares its counter value with the channel period defined by CPRD in the 

 (PWM_CPRDx) and the duty-cycle defined by CDTY in the 

 (PWM_CDTYx) to generate an output signal OCx accordingly.

The different properties of the waveform of the output OCx are:



the clock selection. The channel counter is clocked by one of the clocks provided by the clock generator 
described in the previous section. This channel parameter is defined in the CPRE field of the 

Comparator 

x

Clock

Selector

Channel x

Dead-Time

Generator

Output

Override

OCx

DTOHx

DTOLx

Fault

Protection

OOOHx

PWMHx

PWMLx

OOOLx

Counter

Channel  x

Duty-Cycle

Period

Update

Counter

Channel  0

MUX

SYNCx

Dead-Time

Generator

Output

Override

OCy

DTOHy

DTOLy

Fault

Protection

OOOHy

PWMHy

PWMLy

OOOLy

Channel y (= x+1)

MUX

MU

X

2-bit gray

counter z

Comparator 

y

from

Clock

Generator

from APB

Peripheral Bus

z = 0 (x = 0, y = 1), 
z = 1 (x = 2, y = 3), 
z = 2 (x = 4, y = 5), 
z = 3 (x = 6, y = 7)