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3.5.1 Port 0 (P00 - P07)
Port 0 is an 8-bit general-purpose I/O port. I/O can be set on a
bit basis using control register P0CR to 0 and sets Port 0 to
input mode.
In addition to functioning as a general purpose I/O port,
Port 0 also functions as an address data bus (AD0 to 7). To
access external memory, Port 0 functions as an address data
bus (AD 0 to 7) and all bits of the control register P0CR are
cleared to 0.
With the TMP96C141AF/TMP96C041AF, which comes
with an external ROM, Port 0 always functions as an address
data bus (AD0 to 7) regardless of the value set in control regis-
ter P0CR.
Figure 3.5 (1). Port 0
TOSHIBA CORPORATION
3.5.2 Port 1 (P10 - P17)
Port 1 is an 8-bit general-purpose I/O port. I/O can be set on a
bit basis using control register P1CR and function register
P1FC. Resetting resets all bits of output latch P1, control reg-
ister P1CR, and function register P1FC to 0 and sets Port 1 to
input mode.
In addition to functioning as a general purpose I/O port,
Port 1 also functions as an address data bus (AD8 to 15) or an
address bus (A8 to 15).
With the TMP96C141AF/TMP96C041AF, which comes
with an external ROM, Port 1 always functions as an address
data bus (AD8 to 15) regardless of the value set in control reg-
ister P1CR.
Figure 3.5 (2). Port 1
TMP96C141AF
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