Datasheet

ST7LITE0xY0, ST7LITESxY0
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11.2 12-BIT AUTORELOAD TIMER (AT)
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 a PWM output chan-
nel.
11.2.2 Main Features
■ 12-bit upcounter with 12-bit autoreload register
(ATR)
■ Maskable overflow interrupt
■ PWM signal generator
■ Frequency range 2KHz-4MHz (@ 8 MHz f
CPU
)
– Programmable duty-cycle
– Polarity control
– Maskable Compare interrupt
■ Output Compare Function
Figure 34. Block Diagram
ATCSR
CMPIEOVFIEOVFCK0CK1000
12-BIT AUTORELOAD VALUE
12-BIT UPCOUNTER
CMPF0 bit
CMPF0
CMP INTERRUPT
REQUEST
OVF INTERRUPT
REQUEST
f
CPU
ATR
PWM GENERATION
POL-
ARITY
OP0 bit
PWM0
COMP-
PARE
f
COUNTER
f
PWM
OUTPUT CONTROL
OE0 bit
CNTR
(1 ms timebase
f
LTIMER
DCR0H
DCR0L
Update on OVF Event
Preload
Preload
@ 8MHz)
70
on OVF Event
0
1
12-BIT DUTY CYCLE VALUE (shadow)
OE0 bit
IF OE0=1
1