Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
17-60
Freescale Semiconductor
17.11 MIOS14 16-bit Parallel Port I/O Submodule (MPIOSM)
The MIOS14 parallel port I/O submodule (MPIOSM) is a function included in the MIOS14 library in order
to provide the required port I/O capability. The MPIOSM can operate without the involvement of other
MIOS14 submodules.
Each implemented MPIOSM provides I/O capability for up to 16 signals.
The following sections describe the MPIOSM in detail. A block diagram of one bit of the MPIOSM is
shown in
. The MPIOSM contains 16 such blocks.
Figure 17-30. MPIOSM 1-Bit Block Diagram
1
0
1
Output
Always High
—
—
—
1
1
X
Output
Low Pulse
Rising Edge
Falling Edge
Rising Edge
Table 17-31. Prescaler Values
Prescaler Value
(CP in Hex)
MCPSM Divide
Ratio:
FF
1
FE
2
FD 3
FC
4
FB
5
FA
6
F9
7
F8
8
......
........
02
254 (2^8 -2)
01
255 (2^8 -1)
00
256 (2^8)
Table 17-30. PWMSM Output Signal Polarity Selection (continued)
I/O
Signal
Data
Register
Data
Register
Output
Input
Driver
MIOS14 Bus
(MIOB)
Direction
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