W55P241 Datasheet, PDF (13/32 Pages) List of Unclassifed Manufacturers – I/O device usable with many different microprocessors through SPI interface

PIN
(bit)
Dynamic pull-low input
A=0, D=0
B
W55P241
Pad
B
Dynamic pull-high input
A=1, D=0
PIN
Pad
5.2.9 Dynamic Pull-High Input
When Attribute bit = 1 and Direction bit = 0, the pad is in dynamic pull-high 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 high. Pin bit directly indicates status of the pad.
5.3 Speedup Groups
Although IO port alone suffices to generate all possible IO status, 3 other speedup groups aid to
minimize microcontroller load. Accessing these speedup groups generates specific change of IO
status such as OR, AND or XOR with some data in output mode.
5.4 Wakeup
In addition to 4 SPI pads for communication between master and slave, one specific W55P241 pad,
WAKEUP, is able to wake up the microcontroller. By controlling WAKEN, KC0EN, KC1EN and KC2EN
bits, the status change of any W55P241 I/O pad can wake up the microcontroller. Note that the
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