參數(shù)資料
型號: MR83C154XXX-25/883D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
封裝: LCC-44
文件頁數(shù): 125/141頁
文件大?。?/td> 7628K
代理商: MR83C154XXX-25/883D
54
2486AA–AVR–02/2013
ATmega8(L)
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 and 1- 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 24. 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 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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