ATmega162 datasheet(66/324 Pages) ATMEL

Teilenummer	ATmega162

Bauteilbeschribung	8-bit Microcontroller with 16K Bytes In-System Programmable Flash

PDF	324 Pages

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Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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66 / 324 page

2513K–AVR–07/09

ATmega162/V

Consider the clock period starting shortly after the first falling edge of the system clock. The latch

is closed when the clock is low, and goes transparent when the clock is high, as indicated by the

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 31. 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 31. 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

tpd

ATmega162 Datenblatt(PDF) 66 Page - ATMEL Corporation