HD64F2357VF13 Datasheet, PDF (323/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

9.5 Port 4
9.5.1 Overview
Port 4 is an 8-bit input-only port. 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). Port 4 pin functions are the same in all operating modes. Figure 9-4 shows
the port 4 pin configuration.
Port 4
Port 4 pins
P4₇ (input)/ AN7 (input)/DA1 (output)
P4₆ (input)/ AN6 (input)/DA0 (output)
P4₅ (input)/ AN5 (input)
P4₄ (input)/ AN4 (input)
P4₃ (input)/ AN3 (input)
P4₂ (input)/ AN2 (input)
P4₁ (input)/ AN1 (input)
P4₀ (input)/ AN0 (input)
Figure 9-4 Port 4 Pin Functions
9.5.2 Register Configuration
Table 9-8 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 9-8 Port 4 Registers
Name
Port 4 register
Note: * Lower 16 bits of the address.
Abbreviation
PORT4
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.
9.5.3 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.6.00 Oct.28.2004 page 293 of 1016
REJ09B0138-0600H