- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
71
10.
Description of Operation of Each Function
10.1. Port Driver Function
10.1.1. Port Driver Function Description
The SS-HQ1 system has port driver functions.
With port driver functions, internal parameters can be used for operations by means of switches connected to
P0 to P15 (Pins 91 to 94, 96 to 99, 76 to 80, and 82 to 84) of CXD3172AR.
Input Port Driver
Each port can be assigned arbitrary parameters, and the parameter setting values can be switched by
switches connected to the respective ports, even without external communication.
(Sample Application)
• CPUHOLD
Assign the 1-bit parameter to P0 Switch OFF (Low) = 0[h]/ON (High) = 1[h].
• AESPEED
Assign the 8-bit parameter to P2 Switch OFF (Low) = FF[h]/ON (High) = 20[h].
Output Port Driver
Each port can be assigned arbitrary 1-bit parameters, and changes in the 1-bit parameters can be
monitored from outside the system by sending the parameter status (High or Low) from the ports.
Fig 10.1-1 General Concept
CXD3172AR
Register
Driver
SW
Port
P0
status
P
0
CXD3172AR
Register
Driver
Port
P0
status
P
0
High/Low
output
Input PortDriver
Output PortDriver