Datasheet

Section 8 I/O Ports
Rev.7.00 Feb. 14, 2007 page 252 of 1108
REJ09B0089-0700
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 R/W Initial Value Address
*
Port 4 register PORT4 R Undefined H'FF53
Note: * Lower 16 bits of the address.
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).