S3C4510B
I/O PORTS
I/O PORT DATA REGISTER (IOPDATA)
The I/O port data register, IOPDATA, contains one-bit read values for I/O ports that are configured to input mode
and one-bit write values for ports that are configured to output mode. Bits[17:0] of the 18-bit I/O port register
value correspond directly to the 18 port pins, P17–P0.
Table 12-3. IOPDATA Register
Register
IOPDATA
Offset Address
R/W
Description
I/O port data register
Reset Value
0x5008
R/W
Undefined
31
18 17 16 15 14 13 12 11 10 9
P P P P P P P P P P P P P P P P P P
17 16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1 0
8
7 6 5 4 3 2 1 0
[17:0] I/O port read/write values for ports 17-0 (P0-P17)
NOTE: The values in the I/O port data register reflect the signal level on the
respective I/O port pins. When the ports are configured to output mode,
the bit reflects the ports write value. When the port is configured to input
mode, the bit reflects the ports read value.
Figure 12-4. I/O Port Data Register (IOPDATA)
12-5
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