Rainbow-electronics ATmega128L Manuel d'utilisateur télécharger pdf (Page 64)

100

101

ATmega128(L)

2467B–09/01

Figure 31. Synchronization when Reading a Software Assigned Pin Value

The following code example shows how to set port B pins 0 and 1 high, 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.

nop in r17, PINx

0xFF

0x00

0xFF

out PORTx, r16

SYSTEM CLK

r16

INSTRUCTIONS

SYNC LATCH

PINxn

r17

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 330 331

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Rainbow-electronics ATmega128L Manuel d'utilisateur Page 64

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