s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 380

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

I/O PORTS
I/O PORT SPECIAL REGISTERS
Three registers control the I/O port configuration: IOPMOD, IOPCON, and IOPDATA. These registers are
described in detail below.
I/O PORT MODE REGISTER (IOPMOD)
The I/O port mode register, IOPMOD, is used to configure the port pins, P17–P0.
12-2
IOPMOD
If the port is used for a special function such as an external interrupt request, an external DMA request,
or acknowledge signal and timer outputs, its mode is determined by the IOPCON register, not by
IOPMOD.
Register
31
Offset Address
0x5000
Figure 12-2. I/O Port Mode Register (IOPMOD)
[0] I/O port mode bit for port 0
0 = Input
1 = Output
[1] I/O port mode bit for port 1
0 = Input
1 = Output
[2] I/O port mode bit for port 2
0 = Input
1 = Output
[17] I/O port mode bit for port 17
0 = Input
1 = Output
R/W
R/W
Table 12-1. IOPMOD Register
I/O port mode register
18 17
x
NOTE
16
x
15
x
14
x
13
x
Description
12
x
11
x
10
x
9
x
8
x
7
x
6
x
5
x
4
x
3
x
2
x
Reset Value
0x00000000
1
x
0
x
S3C4510B