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AT90S8535 Datasheet(PDF) 42 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 42 Page - ATMEL Corporation

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42
AT90S/LS8535
1041H–11/01
Note:
X = A
In PWM mode, the Timer Overflow Flag1 (TOV1) is set when the counter advances from
$0000. Timer Overflow Interrupt1 operates exactly as in normal Timer/Counter mode,
i.e., it is executed when TOV1 is set, provided that Timer Overflow Interrupt1 and global
interrupts are enabled. This also applies to the Timer Output Compare1 flags and
interrupts.
8-bit Timer/Counter2
Figure 34 shows the block diagram for Timer/Counter2.
Figure 34. Timer/Counter2 Block Diagram
The 8-bit Timer/Counter2 can select clock source from PCK2 or prescaled PCK2. It can
also be stopped as described in the specification for the Timer/Counter Control Register
(TCCR2).
The diffe rent statu s flag s (Overflow an d Com pare M atch) a re foun d in th e
Timer/Counter Interrupt Flag Register (TIFR). Control signals are found in the
10
TOP
H
1
1
$0000
H
11
TOP
L
Table 16. PWM Outputs OCR1X = $0000 or TOP
COM1X1
COM1X0
OCR1X
Output OC1X
8-BIT DATA BUS
8-BIT ASYNCH T/C2 DATA BUS
ASYNCH. STATUS
REGISTER (ASSR)
TIMER INT. FLAG
REGISTER (TIFR)
TIMER/COUNTER2
(TCNT2)
SYNCH UNIT
8-BIT COMPARATOR
OUTPUT COMPARE
REGISTER2 (OCR2)
TIMER INT. MASK
REGISTER (TIMSK)
0
0
0
7
7
7
T/C CLK SOURCE
UP/DOWN
T/C CLEAR
CONTROL
LOGIC
TOSC1
CK
PCK2
T/C2 OVER-
FLOW IRQ
T/C2 COMPARE
MATCH IRQ
T/C2 CONTROL
REGISTER (TCCR2)
CK


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