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AT90S8535 Datasheet(PDF) 77 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 77 Page - ATMEL Corporation

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77
AT90S/LS8535
1041H–11/01
Port A as General Digital I/O
All eight pins in Port A have equal functionality when used as digital I/O pins.
PAn, general I/O pin: The DDAn bit in the DDRA register selects the direction of this pin.
If DDAn is set (one), PAn is configured as an output pin. If DDAn is cleared (zero), PAn
is configured as an input pin. If PORTAn is set (one) when the pin is configured as an
input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off, the
PORTAn has to be cleared (zero) or the pin has to be configured as an output pin.The
port pins are tri-stated when a reset condition becomes active, even if the clock is not
running.
Note:
n: 7,6…0, pin number.
Port A Schematics
Note that all port pins are synchronized. The synchronization latch is, however, not
shown in the figure.
Figure 51. Port A Schematic Diagrams (Pins PA0 - PA7)
Table 29. DDAn Effects on Port A Pins
DDAn
PORTAn
I/O
Pull-up
Comment
0
0
Input
No
Tri-state (high-Z)
0
1
Input
Yes
PAn will source current if ext. pulled low
1
0
Output
No
Push-pull Zero Output
1
1
Output
No
Push-pull One Output
D
D
Q
Q
RESET
RESET
C
C
WD
WP
RD
MOS
PULL-
UP
PAn
ADCn
TO ADC MUX
WP:
WD:
RL:
RP:
RD:
n:
WRITE PORTA
WRITE DDRA
READ PORTA LATCH
READ PORTA PIN
READ DDRA
0-7
DDAn
PORTAn
RL
RP
PWRDN


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