disable\
input Latch
Clock input
D/O latch CKT
RESET\ (Sec. 3.3.1)
Data
(Sec. 3.3.7)
I/O select (Sec. 3.3.9)
D/I/O
disable
Buffer input
Clock input
D/I buffer CKT
Data
(Sec. 3.3.7)
• The RESET\ is in Low-state Æ all D/I/O operation is disable
• The RESET\ is in High-state Æ all D/I/O operation is enable.
• If D/I/O is configured as D/I port Æ D/I=external input signal
• If D/I/O is configured as D/O port Æ D/I = read back of D/O
• If D/I/O is configured as D/I port Æ send to D/O will change the D/O latch
register only. The D/I & external input signal will not change.
OME-PIO-D144 User’s Manual (Ver.2.1, Sep/2001) ----- 7