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ATTINY2313-20MU データシート(Datasheet) 52 Page - ATMEL Corporation

部品番号. ATTINY2313-20MU
部品情報  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
ダウンロード  231 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
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52
ATtiny2313/V
2543I–AVR–04/06
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 suc-
ceeding positive clock edge. As indicated by the two arrows tpd,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
indicated in Figure 24. The out instruction sets the “SYNC LATCH” signal at the positive
edge of the clock. In this case, the delay tpd through the synchronizer is 1 system clock
period.
Figure 24. 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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