W55P241 Datasheet, PDF (12/32 Pages) List of Unclassifed Manufacturers – I/O device usable with many different microprocessors through SPI interface

D
Inverted open-drain NMOS output
A=0, B=0
PIN
(bit)
W55P241
Pad
D
Pad
Open-drain PMOS output
A=1, B=0
PIN
Figure 7 Inverted open-drain NMOS output and open-drain PMOS output
5.2.7 Open-Drain PMOS Output
When Attribute bit = 1 and Buffer bit = 0, the pad is in open-drain PMOS output mode. If Direction bit
is 0, the pad will be floating. In this condition, the pad functions like floating input. If Direction bit is 1,
the pad will be set to “1.” Pin bit directly indicates pad status.
5.2.8 Dynamic Pull-Low Input
When Attribute bit = 0 and Direction bit = 0, the pad is in dynamic pull-low input mode. If Buffer bit =
0, the pad will be floating. In this case, the pad functions like floating input. If Buffer bit = 1, the pad will
be internally pulled low. Pin bit directly indicates pad status.
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