AT90S8515

Manufacturer Part NumberAT90S8515
Description8-bit microcontroller with 8K bytes in-system programmable flash, 2.7-6.0V
ManufacturerATMEL Corporation
AT90S8515 datasheet
 
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Page 64/112:

Port A Schematics

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Port A Schematics

AT90S8515
64
PORTAn has to be cleared (zero) or the pin has to be configured as an output pin. The
Port A pins are tri-stated when a reset condition becomes active, even if the clock is not
active..
Table 19. DDAn Effects on Port A Pins
DDAn
PORTAn
I/O
Pull-up
0
0
Input
0
1
Input
1
0
Output
1
1
Output
Note:
n: 7,6…0, pin number.
Note that all port pins are synchronized. The synchronization latch is, however, not
shown in the figure.
Figure 45. Port A Schematic Diagrams (Pins PA0 - PA7)
Comment
No
Tri-state (high-Z)
Yes
PAn will source current if ext. pulled low.
No
Push-pull Zero Output
No
Push-pull One Output
0841G–09/01