TMP91C824
91C824-65
2008-02-20
(2)
Port 71 (SO/SDA/OPTTX0)
Port 71 is a general-purpose I/O port. It is also used as SDA (Data input for I
2
C
mode), SO (Data output for SIO mode) for serial bus interface and OPTTX0 (Transmit
output for IrDA mode of SIO0).
Used as OPTTX0, it is possible to logical invert by P7<P71>
=
0.
Figure 3.5.10 Port 71
Open-drain possible:
P7ODE<ODEP71>
SO output
Int
er
nal dat
a
bus
Selector
A
B
S
P71
(SO/SDA, OPTTX0)
P7 read
Direction
control
(on bit basis)
P7CR write
Function
control
(on bit basis)
P7FC write
S
Output latch
P7 write
Reset
SDA input
P-ch
P7FC2 write
C
Logical invert
TXD0 output
Programable
pull up
Selector
A
B
S
Function
control 2
(on bit basis)