CHAPTER 14 PORT FUNCTION
346
(1) Functions of P7 and P8 pins
Port 7 is an 8-bit input-only port and port 8 is a 4-bit input-only port.
The pin statuses can be read by reading the port registers (P7 and P8). Data cannot be written to P7 or P8.
A software pull-up function is not implemented.
Values read from pins specified as analog inputs are undefined values. Do not read values from P7 or P8 while
the A/D converter is operating.
14.2.8 Port 9
Port 9 is a 7-bit I/O port for which I/O settings can be controlled bitwise.
Figure 14-22. Format of 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 (during output mode)
0
Output “0”
1
Output “1”
Remark
During input mode
: When the P9 register is read, the pin levels at that time are read. Writing to P9
writes the current pin levels to that register. This does not affect the input pins.
During output mode : When the P9 register is read, the P9 register’s values are read. Writing to P9
writes values to that register, and those values are immediately output.
Port 9 includes the following alternate-function pins.
Pin Name
Alternate Function
I/O
PULL
Note
Remark
Port 9
P90
LBEN/WRL
I/O
No
−
P91
UBEN
P92
R/W/WRH
P93
DSTB/RD
P94
ASTB
P95
HLDAK
P96
HLDRQ
Note
Software pull-up function
Summary of Contents for V850/SA1 mPD703015
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