Toshiba TLCS-900/H1 Series Data Book page 69

3.5.5 Port 5 (P50 to P57)
Port5 is an 8-bit general-purpose Output ports.
In addition to functioning as a general-purpose I/O port, port5 can also function as an address bus (A8 to A15).
AM1
External address
Port read data
SYMBOL NAME Address
P5 PORT5
PORT5
P5FC Function
Register
PORT5
Drive
P5DR
Register
AM0
0 0
0 1
1 0
1 1
P5FC register
P5 register
Table 3.5.7 Port5 Registers
7 6
P57 P56
0014H
0 0
P57F P56F
0017H
P57D P56D
0085H
Function Setting after reset is released
Don't use this setting
Address Bus(A8 to A15)
Address Bus(A8 to A15)
Output port
Figure 3.5.5 Port5
5 4
P55 P54
0 0
Input/Output
P55F P54F
0:PORT 1:Address Bus(A8 to A15)
P55D P54D
Output/Input buffer drive-register for standby-mode
92CH21 - 65
S
0
1
Selector
3 2
P53 P52
R/W
0 0
P53F P52F
W
0/1
P53D P52D
R/W
1
TMP92CH21
P50 to P57
(A8 to A15)
1 0
P51 P50
0 0
P51F P50F
P51D P50D