Datasheet

ST72321Rx ST72321ARx ST72321Jx
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10.3 PWM AUTO-RELOAD TIMER (ART)
10.3.1 Introduction
The Pulse Width Modulated Auto-Reload Timer
on-chip peripheral consists of an 8-bit auto reload
counter with compare/capture capabilities and of a
7-bit prescaler clock source.
These resources allow five possible operating
modes:
– Generation of up to 4 independent PWM signals
– Output compare and Time base interrupt
– Up to two input capture functions
– External event detector
– Up to two external interrupt sources
The three first modes can be used together with a
single counter frequency.
The timer can be used to wake up the MCU from
WAIT and HALT modes.
Figure 36. PWM Auto-Reload Timer Block Diagram
OVF INTERRUPT
EXCL CC2 CC1 CC0 TCE FCRL OIE OVF
ARTCSR
f
INPUT
PWMx
PORT
FUNCTION
ALTERNATE
OCRx
COMPARE
REGISTER
PROGRAMMABLE
PRESCALER
8-BIT COUNTER
(CAR REGISTER)
ARR
REGISTER
ICRx
REGISTER
LOAD
OPx
POLARITY
CONTROL
OEx
PWMCR
MUX
f
CPU
DCRx
REGISTER
LOAD
f
COUNTER
ARTCLK
f
EXT
ARTICx
ICFxICSx
ICCSR
LOAD
ICx INTERRUPT
ICIEx
INPUT CAPTURE
CONTROL