CHAPTER 14 PORT FUNCTION
User’s Manual U13850EJ4V0UM
401
14.2.8 Port 9
Port 9 is a 7-bit I/O port for which I/O settings can be controlled in 1-bit units.
Figure 14-33. Port 9 (P9)
After reset:
00H
R/W
Address: FFFFF012H
7
6
5
4
3
2
1
0
P9
0
P96
P95
P94
P93
P92
P91
P90
P9n
Control of output data (in output mode) (n = 0 to 6)
0
Outputs 0
1
Outputs 1
Remark
In input mode:
When the P9 register is read, the pin levels at that time are read. Writing to P9 writes
the values to that register. This does not affect the input pins.
In output mode: When the P9 register is read, the P9 register’s values are read. Writing to P9 writes
the values to that register, and those values are immediately output.
Port 9 includes the following alternate functions.
Table 14-9. Port 9 Alternate Function Pins
Pin Name
Alternate Function
I/O
PULL
Note
Remark
P90
LBEN/WRL
P91
UBEN
P92
R/W/WRH
P93
DSTB/RD
P94
ASTB
P95
HLDAK
Port 9
P96
HLDRQ
I/O
No
−
Note
Software pull-up function