I/O Port Function Control Register - Samsung S3C2501X User Manual

I/O PORTS
12.3.2 I/O PORT FUNCTION CONTROL REGISTER (IOPCON1/2)
The I/O port function select registers, IOPCON1/2, are used for function select. IOPCON1/2 are used to
configure external interrupt signals, GDMA Req/Ack signals, timer signals and UART Tx/Rx signals. For
example, if you set IOPCON1[14] to '0', then port14 is used for GDMA Req port. If you set the IOPGDMA[14] to
'1', then port14 is used for GPIO.
If the port is used for a function's port such as an external interrupt request or an external GDMA
Req/Ack signal, its signal function is determined by IOPGDMA or IOPEXTINT register.
Register Address
IOPCON1 0xF0030008
IOPCON2 0xF003000C
12-4
NOTE
Table 12-3. IOPCON1/2 Register
R/W
R/W I/O port function control register for port 0 to 31
R/W I/O port function control register for port 32 to 63
Description
S3C2501X
Reset Value
0xFFFFFF00
0xFFFFFC07