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ST7DALI Datasheet(PDF) 55 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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11.2 12-BIT AUTORELOAD TIMER 2 (AT2)
11.2.1 Introduction
The 12-bit Autoreload Timer can be used for gen-
eral-purpose timing functions. It is based on a free-
running 12-bit upcounter with an input capture reg-
ister and four PWM output channels. There are 6
external pins:
– Four PWM outputs
– ATIC pin for the Input Capture function
– BREAK pin for forcing a break condition on the
PWM outputs
11.2.2 Main Features
■ 12-bit upcounter with 12-bit autoreload register
(ATR)
■ Maskable overflow interrupt
■ Generation of four independent PWMx signals
■ Frequency 2KHz-4MHz (@ 8 MHz fCPU)
– Programmable duty-cycles
– Polarity control
– Programmable output modes
– Maskable Compare interrupt
■ Input Capture
– 12-bit input capture register (ATICR)
– Triggered by rising and falling edges
– Maskable IC interrupt
Figure 33. Block Diagram
ATCSR
CMPIE
OVFIE
OVF
CK0
CK1
ICIE
ICF
0
12-BIT AUTORELOAD REGISTER
12-BIT UPCOUNTER
CMPF2
CMPF1
CMPF3
CMPF0
CMP
REQUEST
OVF INTERRUPT
REQUEST
fCPU
ATIC
12-BIT INPUT CAPTURE REGISTER
IC INTERRUPT
REQUEST
ATR
ATICR
fCOUNTER
CNTR
32 MHz
(1 ms
fLTIMER
@ 8MHz)
CMPFx bit
POL-
ARITY
OPx bit
PWMx
COMP-
PARE
fPWM
OEx bit
4 PWM Channels
INTERRUPT
timebase
DCR0H
DCR0L
Preload
Preload
on OVF Event
12-BIT DUTY CYCLE VALUE (shadow)
IF TRAN=1
1




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