Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
17-46
Freescale Semiconductor
17.10 MIOS14 Pulse Width Modulation Submodule (MPWMSM)
The MIOS14 pulse width modulation submodule (MPWMSM) is a function included in the MIOS14
library. It allows pulse width modulated signals to be generated over a wide range of frequencies,
independently of other MIOS14 output signals and with no software intervention. The output pulse width
can vary from 0% to 100%. The minimum pulse width is twice the minimum MIOS14 CLOCK period
(i.e., the minimum pulse width is 50 ns when f
SYS
is 40 MHz). The MWPMSM can run in a
double-buffered mode, to avoid spurious update.
The following sections describe the MPWMSM in detail. A block diagram of the MPWMSM is shown in
.
1110
9
0-6
OPWM – Output pulse width modulation
1111
7
0-8
OPWM – Output pulse width modulation
Table 17-23. MDASM Counter Bus Selection
Sub-
Module
Type
Block
Number
Connected to:
CBA
CBB
CBC
CBD
BSL0=0
BSL1=0
BSL0=1
BSL1=0
BSL0=0
BSL1=1
BSL0=1
BSL1=1
MDASM
11
CB6
CB22
CB7
CB8
MDASM
12
CB6
CB22
CB7
CB8
MDASM
13
CB6
CB22
CB23
CB24
MDASM
14
CB6
CB22
CB23
CB24
MDASM
15
CB6
CB22
CB23
CB24
MDASM
27
CB6
CB22
CB23
CB24
MDASM
28
CB6
CB22
CB23
CB24
MDASM
29
CB6
CB22
CB7
CB8
MDASM
30
CB6
CB22
CB7
CB8
MDASM
31
CB6
CB22
CB7
CB8
Table 17-22. MDASM Mode Selects (continued)
MDASM Control Register Bits
Bits of
Resolution
Counter
Bus Bits
Ignored
MDASM Mode of Operation
MODE
Summary of Contents for MPC561
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