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ATMEGA640 데이터시트(PDF) 70 Page - Microchip Technology

부품명 ATMEGA640
상세설명  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 데이터시트(HTML) 70 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
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 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 13-4.
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 one system clock period.
Figure 13-4. Synchronization when Reading a Software Assigned Pin Value
The following code example shows how to set port B pins 0 and 1 high, pins 2 and 3 low, and define the port pins
from 4 to 7 as input with pull-ups assigned to port pins 6 and 7. The resulting pin values are read back again, but as
previously discussed, a nop instruction is included to be able to read back the value recently assigned to some of
the pins.
out PORTx, r16
nop
in r17, PINx
0xFF
0x00
0xFF
SYSTEM CLK
r16
INSTRUCTIONS
SYNC LATCH
PINxn
r17
t
pd



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