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10.4.2
Register Configuration
Table 10-6 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 10-6 Port 4 Registers
Name
Port 4 register
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
:
Initial value :
R/W
:
Note: * Determined by state of pins P47 to P40.
10.4.3
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).
354
Abbreviation
PORT4
7
6
P47
P46
—*
—*
R
R
R/W
R
5
4
P45
P44
—*
—*
R
R
Initial Value
Undefined
3
2
P43
P42
—*
—*
R
R
Address*
H'FFB3
1
0
P41
P40
—*
—*
R
R
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