PXN20RM Datasheet, PDF (234/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

System Integration Unit (SIU)
Offset: SIU_BASE + 0x0C4C
Access: User read-only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
PG0:PG15
W
Reset U U U U U U U U U U U U U U U U
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
PH0:PH15
W
Reset U U U U U U U U U U U U U U U U
Figure 8-43. Parallel GPIO Pin Data Input Register 3 (SIU_PGPDI3)
8.3.2.36 Parallel GPIO Pin Data Input Register 4 (SIU_PGPDI4)
Reads to the SIU_PGPDI4 register provide the parallel GPIO pin data input for PJ0:PJ15 and PK0:PK10.
Writes have no effect.
Reads of this register are coherent with the registers SIU_GPDI128_131, SIU_GPDI132_135,
SIU_GPDI136_139, SIU_GPDI140_143, SIU_GPDI144_147, SIU_GPDI148_151, and
SIU_GPDI152_154.
Offset: SIU_BASE + 0x0C50
Access: User read-only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
PJ0:PJ15
W
Reset U U U U U U U U U U U U U U U U
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
PK0:PK10
0
0
0
0
0
W
Reset U
U
U
U
U
UUU
U
UU
0
0
0
0
0
Figure 8-44. Parallel GPIO Pin Data Input Register 4 (SIU_PGPDI4)
8.3.2.37 Masked Parallel GPIO Pin Data Output Register 1 (SIU_MPGPDO1)
The purpose of the masked parallel GPIO pin data output registers is to allow any combination of bits in
a 16-bit parallel GPIO pin data output port to be updated in a single 32-bit write operation, while allowing
other bits to maintain their previous state. This is accomplished by grouping each 16-bit port with a 16-bit
mask register, and only updating those bits in the data register for which the corresponding mask bit is set.
For example, if the current state of the port B parallel GPIO pin data output register is 0x1234 and you
want to change only bits [12:15] (i.e., the 4) to be an 8, then a 32-bit write with a mask value of 0x000C
and data value of 0x0008 (i.e.,0x000C_0008) would be performed.
The masked parallel GPIO pin data output registers always read as 0.
The SIU_MPGPDO1 register contains the Masked Parallel GPIO Pin Data Output for PB[0:15].
8-52
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor