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13.3 Detailed Description
13.3.1
Selecting PIO Pins
Of the 16-bit PIO signals, signals PIO[15:8] can be used in combination with 8-bit ECC check bit
signals. The configuration signal (ADDR[18]) at boot up determines which function will be used. See
3.3 Configuration Signals for more information.
13.3.2
General-purpose Parallel Port
The four following registers are used to control the PIO port.
•
PIO Output Data Register (PIODO)
•
PIO Input Data Register (PIODI)
•
PIO Direction Control Register (PIODIR)
•
PIO Open Drain Control Register (PIOOD)
PIO signals can be selected by the PIO Direction Control Register (PIODIR) for each bit as either
input or output.
Signals selected as output signals output the values written into the PIO Data Output Register
(PIODO). The PIO Open Drain Control Register (PIOOD) can select whether each bit is either an open
drain output or a totem pole output.
PIO signal status is indicated by the PIO Data Input Register. This register can be read out at any time
regardless of the pin direction settings.
13.4 Registers
Offset Address
0xF500
0xF504
0xF508
0xF50C
Table 13.4.1 PIO Register Map
Mnemonic
PIODO
Output Data Register
PIODI
Input Data Register
PIODIR
Direction Control Register
PIOOD
Open Drain Control Register
13-2
Chapter 13 Parallel I/O Port
Register Name
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