XC2200 Derivatives
System Units (Vol. 1 of 2)
Parallel Ports
User’s Manual
7-15
V2.1, 2008-08
Parallel Ports, V1.6D6
1000
B
Output
(Direct
input)
Push-
pull
General purpose Output
Output driver off.
Input Schmitt trigger off.
Pn_OUT delivered to the internal
logic; no pull
1001
B
Output function ALT1
1010
B
Output function ALT2
1011
B
Output function ALT3
1100
B
Output
(Direct
input)
Open-
drain
General purpose Output
1101
B
Output function ALT1
1110
B
Output function ALT2
1111
B
Output function ALT3
1)
In power saving mode, the input Schmitt trigger is always switched off. A defined input value is driven to the
internal circuitry instead of the level detected at the input pin.
2)
If the IOCR setting is “inverted input”, then an inverted signal Pn_OUT is driven internally. The Pn_OUT
register itself always contains the real, non-inverted input value of the pin. See
Table 7-4
PC Coding
PC[3:0]
I/O
Selected Pull-up/down /
Selected Output Function
Behavior in Power Saving
Mode
1)