Toshiba TLCS-900/L1 Series Manual page 61

3.5.3 Port 5 (P54 to P56)
Port 5 is an 3-bit general-purpose I/O port. I/O is set using control register P5CR and
P5FC. Resetting resets all bits of the output latch P5 to 1, the control register P5CR and
the function register P5FC to 0 and sets P54 to P56 to input mode with pull-up resistor.
In addition to functioning as a general-purpose I/O port, port 5 also functions as I/O for
the CPU's control/status signal.
Direction control
(on bit basis)
Function control
(on bit basis)
Reset
P5CR write
P5FC write
S
S
A
Output
latch
B
P5 write
BUSAK
P5 read
Figure 3.5.4 Port 5 (P55)
91C824-59
P-ch (Programmable pull up)
Output buffer
TMP91C824
P55( )
BUSAK
2008-02-20