Motorola MPC533 Reference Manual page 729

— Software selectable output pulse polarity
— Software readable output signal status
— Possible use of signal as I/O port when PWM function is not needed
• MIOS14 16-bit parallel port I/O submodule (MPIOSM):
— Up to 16 parallel I/O signals per MPIOSM
— Uses four 16-bit registers in the address space, one for data and one for direction
and two reserved
— Simple data direction register (DDR) concept for selection of signal direction
17.2.1 Submodule Numbering, Naming, and Addressing
A block is a group of four 16-bit registers. Each of the blocks within the MIOS14
addressing range is assigned a block number. The first block is located at the base address
of the MIOS14. The blocks are numbered sequentially starting from 0.
Every submodule instantiation is also assigned a number. The number of a given
submodule is the block number of the first block of this submodule.
A submodule is assigned a name made of its acronym followed by its submodule number.
For example, if submodule number 18 were an MPWMSM, it would be named
MPWMSM18.
This numbering convention does not apply to the MBISM, the MCPSM and the MIRSMs.
The MBISM and the MCPSM are unique in the MIOS14 and do not need a number. The
MIRSMs are numbered incrementally starting from zero.
The MIOS14 base address is defined at the chip level and is referred to as the "MIOS14
base address." The MIOS14 addressable range is four Kbytes.
The base address of a given implemented submodule within the MIOS14 is the sum of the
base address of the MIOS14 and the submodule number multiplied by eight. Refer to
Table 17-1.
This does not apply to the MBISM, the MCPSM and the MIRSMs. For these submodules,
refer to the MIOS14 memory map in Figure 17-2.
17.2.2 Signal Naming Convention
In Figure 17-2, MDASM signals have a prefix MDA, MPWMSM signals have a prefix of
MPWM and the port signals have a prefix of MPIO. The modulus counter clock and load
signals are multiplexed with MDASM signals.
The MIOS14 input and output signal names are composed of five fields according to the
following convention:
• "M"
MOTOROLA Chapter 17. Modular Input/Output Subsystem (MIOS14)
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
MIOS14 Key Features
17-5