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ST72321xx-Auto PWM auto-reload timer (ART)
Doc ID 13829 Rev 1 87/243
12 PWM auto-reload timer (ART)
12.1 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 2 input capture functions
External event detector
Up to 2 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 35. 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
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
8-BIT COUNTER
(CAR REGISTER)
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