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ATMEGA128 データシート(PDF) 69 Page - ATMEL Corporation

部品番号 ATMEGA128
部品情報  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA128 データシート(HTML) 69 Page - ATMEL Corporation

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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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