at90s8535 datasheet(67/127 Pages) ATMEL

Part #	AT90S8535

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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AT90S/LS8535

1041H–11/01

• Bit 2 – ACIC: Analog Comparator Input Capture Enable

When set (one), this bit enables the Input Capture function in Timer/Counter1 to be trig-

gered by the Analog Comparator. The comparator output is in this case directly

connected to the Input Capture front-end logic, making the comparator utilize the noise

canceler and edge select features of the Timer/Counter1 Input Capture interrupt. When

cleared (zero), no connection between the Analog Comparator and the Input Capture

function is given. To make the comparator trigger the Timer/Counter1 Input Capture

interrupt, the TICIE1 bit in the Timer Interrupt Mask Register (TIMSK) must be set (one).

• Bits 1,0 – ACIS1, ACIS0: Analog Comparator Interrupt Mode Select

These bits determine which comparator events trigger the Analog Comparator interrupt.

The different settings are shown in Table 25.

Note:

When changing the ACIS1/ACIS0 bits, the Analog Comparator interrupt must be dis-

abled by clearing its interrupt enable bit in the ACSR register. Otherwise an interrupt can

occur when the bits are changed.

Caution: Using the SBI or CBI instruction on bits other than ACI in this register will write

a “1” back into ACI if it is read as set, thus clearing the flag.

Table 25. ACIS1/ACIS0 Settings

ACIS1

ACIS0

Interrupt Mode

0

Comparator Interrupt on Output Toggle

01

Reserved

1

0

Comparator Interrupt on Falling Output Edge

1

Comparator Interrupt on Rising Output Edge

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