SSC050-01 Datasheet, PDF (27/79 Pages) Maxim Integrated Products – Two-Wire Serial Backplane Controller

Control Registers
Control Register Definition
SSC050-01
Data Sheet
14h: I/O Port 4 Data Direction (DDP4)
Register Name:
Address:
Reset Value:
Description
DDP4
14h
1111_1111b
I/O Port 4 Data Direction
7
6
5
4
3
2
1
0
Data Direction
Bit(s) Bit Label
7:0
DDP0.7-0
Access Description
R/W Data Direction
These bits determine the direction of the data flow through the I/O pin.
To enable the respective I/O pin as an input, set the appropriate bit. To enable the
respective I/O pin as an output, reset the appropriate bit. Each I/O pin can be individ-
ually configured as a true bidirectional function. Additionally, an open-drain or open-
source function can be developed by resetting or setting the appropriate data bit and
using the data direction bit as the programmed data value.
After a reset or power-on, these bits will be set to a binary one, enabling the I/O as
an input with weak pull-up.
Revision 4.0
November 10, 2004
4-11