TMP91C824
91C824-55
3.5.1
Port 1 (P10 to P17)
Port 1 is an 8-bit general-purpose I/O port. Each bit can be set individually for input or output using the
control register P1CR. Resetting , the control register P1CR to “0” and sets Port 1 to input mode.
In addition to functioning as a general-purpose I/O port, Port 1 can also function as an address data bus
(D8 to 15).
In
te
rn
a
l d
a
ta
b
u
s
Direction
control
(on bit basis)
P1CR write
P10 to P17
(D8 to D15)
Output buffer
Reset
P1 Read
Output Latch
P1 write
Port 1
Figure 3.5.1 Port 1