ATA6603-EK Atmel, ATA6603-EK Datasheet - Page 89
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ATA6603-EK
Manufacturer Part Number
ATA6603-EK
Description
MCU, MPU & DSP Development Tools Demoboard LIN-MCM
Manufacturer
Atmel
Datasheet
1.ATA6603P-PLQW.pdf
(360 pages)
Specifications of ATA6603-EK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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4.10.2.2
4.10.2.3
4.10.2.4
4921E–AUTO–09/09
Toggling the Pin
Switching Between Input and Output
Reading the Pin Value
Writing a logic one to PINxn toggles the value of PORTxn, independent on the value of DDRxn.
Note that the SBI instruction can be used to toggle one single bit in a port.
When switching between tri-state ({DDxn, PORTxn} = 0b00) and output high ({DDxn, PORTxn}
= 0b11), an intermediate state with either pull-up enabled {DDxn, PORTxn} = 0b01) or output
low ({DDxn, PORTxn} = 0b10) must occur. Normally, the pull-up enabled state is fully accept-
able, as a high-impedant environment will not notice the difference between a strong high driver
and a pull-up. If this is not the case, the PUD bit in the MCUCR Register can be set to disable all
pull-ups in all ports.
Switching between input with pull-up and output low generates the same problem. The user
must use either the tri-state ({DDxn, PORTxn} = 0b00) or the output high state ({DDxn, PORTxn}
= 0b11) as an intermediate step.
Table 4-30
Table 4-30.
Independent of the setting of Data Direction bit DDxn, the port pin can be read through the
PINxn Register bit. As shown in
ing latch constitute a synchronizer. This is needed to avoid metastability if the physical pin
changes value near the edge of the internal clock, but it also introduces a delay.
page 90
value. The maximum and minimum propagation delays are denoted t
respectively.
DDxn
0
0
0
1
1
shows a timing diagram of the synchronization when reading an externally applied pin
PORTxn
summarizes the control signals for the pin value.
0
1
1
0
1
Port Pin Configurations
(in MCUCR)
PUD
X
X
X
0
1
Figure 4-23 on page
Output
Output
Input
Input
Input
I/O
Pull-up
Yes
No
No
No
No
88, the PINxn Register bit and the preced-
Comment
Tri-state (Hi-Z)
Pxn will source current if ext. pulled low.
Tri-state (Hi-Z)
Output Low (Sink)
Output High (Source)
ATA6602/ATA6603
pd,max
Figure 4-24 on
and t
pd,min
89
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