SSC050-01 Datasheet, PDF (61/79 Pages) Maxim Integrated Products – Two-Wire Serial Backplane Controller

Control Registers
Control Register Definition
SSC050-01
Data Sheet
Bit(s) Bit Label
0 GPD
Access Description
R/W General Purpose Data
When the I/O pin has been enabled as an output, writing this bit determines the data
value which will be present on the corresponding I/O pin. If the I/O pin has been ena-
bled as an input, reading this register bit will represent the current voltage applied to
the pin. At no time will this bit directly represent the value latched into the data regis-
ter. If the pin is enabled as an input and there is no signal applied, a weak internal
pull-up resistor will hold the pin at a binary one. After a reset or power-on, this regis-
ter bit will be set to a binary one, but the value returned from a register read will be
the level applied to the pin since by default each pin is an input.
Revision 4.0
November 10, 2004
4-45