AT91SAM7S256_0410 Datasheet, PDF (24/32 Pages) ATMEL Corporation – AT91 ARM Thumb-based Microcontrollers

Peripheral Multiplexing on PIO Lines
The AT91SAM7S256 features one PIO controller, PIOA, that multiplexes the I/O lines of
the peripheral set.
PIO Controller A controls 32 lines. Each line can be assigned to one of two peripheral
functions, A or B. Some of them can also be multiplexed with the analog inputs of the
ADC Controller.
Table 3 on page 25 defines how the I/O lines of the peripherals A, B or the analog inputs
are multiplexed on the PIO Controller A. The two columns “Function” and “Comments”
have been inserted for the user’s own comments; they may be used to track how pins
are defined in an application.
Note that some peripheral functions that are output only may be duplicated in the table.
All pins reset in their Parallel I/O lines function are configured in input with the program-
mable pull-up enabled, so that the device is maintained in a static state as soon as a
reset is detected.
24 _{AT91SAM7S256 Summary Preliminary}
6117AS–ATARM–20-Oct-04