D12320VF25V Datasheet, PDF (286/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 I/O Ports
8.5.2 Register Configuration
Table 8.8 shows the port 4 register configuration. Port 4 is an input-only port, and does not have a
data direction register or data register.
Table 8.8 Port 4 Register
Name
Abbreviation
Port 4 register
PORT4
Note: * Lower 16 bits of the address.
R/W Initial Value
R
Undefined
Address^*
H'FF53
Port 4 Register (PORT4): The pin states are always read when a port 4 read is performed.
Bit
:
7
6
5
4
3
2
1
0
P47
P46
P45
P44
P43
P42
P41
P40
Initial value : —^*
—^*
—^*
—^*
—^*
—^*
—^*
—^*
R/W
:R
R
R
R
R
R
R
R
Note: * Determined by state of pins P47 to P40.
8.5.3 Pin Functions
Port 4 pins also function as A/D converter analog input pins (AN0 to AN7) and D/A converter
analog output pins (DA0 and DA1).
Rev.7.00 Feb. 14, 2007 page 252 of 1108
REJ09B0089-0700