ATMEGA8515-16AU datasheet(61/254 Pages) ATMEL

Part #	ATMEGA8515-16AU

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

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Manufacturer	ATMEL [ATMEL Corporation]

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61

ATmega8515(L)

2512G–AVR–03/05

signal transition on the pin will be delayed between ½ and 1½ system clock period

depending upon the time of assertion.

When reading back a software assigned pin value, a nop instruction must be inserted as

indicated in Figure 32. The out instruction sets the “SYNC LATCH” signal at the positive

edge of the clock. In this case, the delay t

pd through the synchronizer is one system

clock period.

Figure 32. Synchronization when Reading a Software Assigned Pin Value

out PORTx, r16

nop

in r17, PINx

0xFF

0x00

0xFF

SYSTEM CLK

r16

INSTRUCTIONS

SYNC LATCH

PINxn

r17

t

pd

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