ATMEGA128-16AU datasheet(69/386 Pages) ATMEL

Part #	ATMEGA128-16AU

Description	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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69 / 386 page

69

2467R–AVR–06/08

ATmega128

shaded region of the “SYNC LATCH” signal. The signal value is latched when the system clock

goes low. It is clocked into the PINxn Register at the succeeding positive clock edge. As indi-

cated by the two arrows t

pd,max and tpd,min, a single 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 indi-

cated 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

nop

in r17, PINx

0xFF

0x00

0xFF

tpd

out PORTx, r16

SYSTEM CLK

r16

INSTRUCTIONS

SYNC LATCH

PINxn

r17

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