Toshiba H1 Series Data Book page 169

3.7.20 Port U (PU0 to PU7)
Port U0 to U7 are 8-bit general-purpose I/O ports. Each bit can be set individually for
input or output. Resetting sets port U0 to U7 to input port and output latch to "0". In
addition to functioning as general-purpose I/O port pins, PU0 to PU7 can also function as
data bus pin for LCD controller (LD16 to LD23) and SDCLK input function.
Above setting is used the control register PUCR and function register PUFC.
In addition to functioning as above function, PU7 can also function as communication for
debug mode (EO_TRGOUT). These functions are operated when it is started in debug
mode. In this case, PU7 can not be used as LD23 function.
Reset
Direction
control
(on bit basis)
PUCR write
Function
control
(on bit basis)
PUFC write
R
Output latch
PU write
LD16 to LD20, LD22,LD23
EO_TRGOUT
PU read
Figure 3.7.54 Port U0 to U4 , U6 , U7
Debug mode
S
A
Selector
B
C
S
B
Selector
A
92CZ26A-166
TMP92CZ26A
PU0~PU4,PU6
(LD16 to LD20,LD22)
PU7
(LD23,EO_TRGOUT)