W55P241 Datasheet, PDF (9/32 Pages) List of Unclassifed Manufacturers – I/O device usable with many different microprocessors through SPI interface

W55P241
Table 1 Command list
5.2 BP0/BP1/BP2
Each bi-directional pin can be controlled independently and IO status (or function) is determined by
Buffer bit, Direction bit and Attribute bit. In input mode, reading the Pin bit reveals the status of the
corresponding I/O pin. The combinations are listed in the following table. For simplicity, B stands for
Buffer, D stands for Direction, A stands for Attribute, and P stands for Pin.
ATTRIBUTE DIRECTION BUFFER
IO status
Function
0
0
0
Floating(default)
Floating input
0
0
1
Pull low
Pull-low input
1
0
1
Pull high
Pull-high input
0
1
0
Output low
0
1
1
Output high
Buffer output
1
0
0
Floating
Open-drain PMOS output
1
1
0
Output high
1
0
1
Pull high
1
1
1
Output low
Wire AND (inverted)
0
1
0
Output low
Open-drain NMOS output (inverted)
0
0
0
Floating
0
0
1
Pull low
0
1
1
Output high
Wired OR
0
0
0
Floating
0
0
1
Pull low
Dynamic pull-low input
1
0
0
Floating
1
0
1
Pull high
Dynamic pull-high input
1
1
0
Output high
1
1
1
Output low
Inverted buffer output
Table 2 Combination of IO status
5.2.1 Input with High Impedance
When Attribute bit = 0 or 1, Direction bit = 0 and Buffer bit = 0, the pad is in floating input mode.
Value of the Pin bit depends on the corresponding pad.
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