Pin Data Input/Output - NEC V850E/Dx3 Preliminary User's Manual

Chapter 2
15
Pn15 Pn14 Pn13 Pn12 Pn11 Pn10
R/W
46
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2.2.3 Pin data input/output

If a pin is in port mode, the registers for pin data input/output specify the input
and output data.
(1) Pn - Port register
In port mode (PMCn.PMCnm=0), data is input from or output to an external
device by writing or reading the Pn register.
For port groups with up to eight ports, this is an 8-bit register. For port groups
with up to 16 ports, this is a 16-bit register.
Access This register can be read/written in 8-bit and 1-bit units.
16-bit registers can also be read/written in 16-bit units.
Address see "Port Group Configuration" on page 56
Initial Value 00 or 0000
H
Note After reset, the ports are in input mode (PMn.PMnm = 1). The read input value
is determined by the port pins.
7
Pn7 Pn6
R/W R/W
14 13 12 11 10
R/W R/W R/W R/W R/W
Table 2-9 Pn register contents
Bit position
7 to 0
or
15 to 0
Note The value written to register Pn is retained until a new value is written to
register Pn.
Data is written to or read from the Pn register as follows:
Table 2-10 Writing/reading register Pn
Function
Write to Pn
and output contents of Pn to pins
Write to Pn
without affecting the pin status
Read from Pn
and thus read the pin status
Read from Pn
and disregard the pin status
Preliminary User's Manual U17566EE1V2UM00
. This register is cleared by any reset.
H
6 5 4 3
Pn5 Pn4 Pn3
R/W R/W R/W
9 8 7 6
Pn9 Pn8 Pn7 Pn6
R/W R/W R/W R/W
Bit name
Pn[7:0] Data, see Table 2-10 for details.
or
Pn[15:0]
Pin Functions
2 1 0
Pn2 Pn1 Pn0
R/W R/W R/W
5 4 3 2
Pn5 Pn4 Pn3 Pn2 Pn1
R/W R/W R/W R/W R/W
Function
PM
0
1
1
0
1
1 0
Pn0
R/W
I/O
O
I
I
O
I