Toshiba TLCS-900/L1 Series Manual page 67

(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
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.
Reset
Function
control 2
(on bit basis)
P7FC2 write
Direction
control
(on bit basis)
P7CR write
Function
control
(on bit basis)
P7FC write
S
Output latch
P7 write
SO output
TXD0 output
Logical invert
P7 read
SDA input
S
A
Selector
B
Open-drain possible:
C
P7ODE<ODEP71>
S
B
Selector
A
Figure 3.5.10 Port 71
91C824-65
TMP91C824
C
2
Programable
P-ch
pull up
P71
(SO/SDA, OPTTX0)
2008-02-20