Toshiba H1 Series Data Book page 123

P4
bit Symbol
(0010H)
Read/Write
After reset
P4FC bit Symbol P47F
(0013H)
Read/Write
After reset
Note2:
Function
P4DR
bit Symbol P47D
(0084H)
Read/Write
After reset
Function
Note1: Read-modify-write is prohibited for P4FC.
Note2: It is set to "Port" or "Data bus" by AM pins state.
7 6 5
P47 P46 P45
0 0 0
Port 4 Function register
7 6 5
P46F P45F
0/1 0/1 0/1
Port 4 Drive register
7 6 5
P46D P45D
1 1 1
Input/Output buffer drive register for standby mode
Figure 3.7.4 Register for Port1r
92CZ26A-120
Port 4 register
4 3
P44 P43
R/W
0 0
4 3
P44F P43F
W
0/1 0/1
0:Port 1:Address bus (A0 to A7)
4 3
P44D P43D
R/W
1 1
TMP92CZ26A
2 1 0
P42 P41 P40
0 0 0
2 1 0
P42F P41F P40F
0/1 0/1 0/1
2 1 0
P42D P41D P40D
1 1 1