AT90LS8535-4AI datasheet(42/127 Pages) ATMEL

42 / 127 page

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

TOP

$0000

TOP

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

TIMER INT. FLAG

TIMER/COUNTER2

(TCNT2)

SYNCH UNIT

8-BIT COMPARATOR

OUTPUT COMPARE

REGISTER2 (OCR2)

TIMER INT. MASK

T/C CLK SOURCE

UP/DOWN

T/C CLEAR

CONTROL

LOGIC

TOSC1

PCK2

T/C2 OVER-

FLOW IRQ

T/C2 COMPARE

MATCH IRQ

T/C2 CONTROL

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