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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 D15).
When AM1 = 0 and AM0 = 1, port 10 to 17 always operate data bus function even if it
changes P1CR setting.
Direction control
Reset
(on bit basis)
P1CR write
Output latch
Output buffer
P1 write
P1 read
Figure 3.5.1 Port 1
91C824-56
TMP91C824
Port 1
P10 to P17
(D8 to D15)
2008-02-20
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