MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 486

• Manufacturer Part Number: MC68F375BGMZP33
• Description: IC MPU 32BIT 33MHZ 217-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68F375BGMZP33

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 217-PBGA
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Program Memory Type: Flash
• Program Memory Size: 256 KB
• Data Ram Size: 10 KB
• Interface Type: SPI, SCI, CAN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 16
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: No

13.11.6 CTM9 Output Pulse Width Modulation With DASM
MC68F375
REFERENCE MANUAL
Output waveforms can be generated with any duty cycle without software involvement.
The software sets up a DASM with the compare times for the rising and falling edges,
and they are automatically repeated. The software does not need to respond to inter-
rupts to generate continuous pulses. The period may be selected as the period of a
free-running counter submodule time-base, times a binary multiplier selected in the
DASM. Multiple PWM outputs can be created from multiple DASMs and share one
counter submodule, provided that the periods of all of the output signals are a binary
multiple of the time-base, and that the counter submodule is operating in a free-run-
ning mode. Each DASM has a software selectable “don’t care” on high-order bits of
the time-base comparison so that the period of one output can be a binary multiple of
another signal. Masking the time-base serves to multiply the period of the time-base
by a binary number to form the period of the output waveform. The duty cycle can vary
from one cycle to 64K cycles. The frequency can range from 0.3 Hz to 62.5 KHz,
though the resolution decreases at the higher frequencies to as low as 7 bits. The gen-
eration of output square wave signals is of course the special case where the high and
low time are equal.
When an MCSM is used to drive the time-base, the modulus value is the period of the
output PWM signal.
edge of an output waveform is programmable for a rising or a falling edge. The soft-
ware selects the period of the output signal by programming the MCSM with a modulus
Prescaler
Select
Clock
or Pin
From
Modulus Counter Submodule
Figure 13-19 CTM9 Example — Double Edge Output Compare
Free Running or
16-Bit Up Counter
Freescale Semiconductor, Inc.
Figure 13-20
For More Information On This Product,
CONFIGURABLE TIMER MODULE (CTM9)
Select
Bus
Submodule Bus
Go to: www.freescale.com
Rev. 25 June 03
shows such an example. The polarity of the leading
Buses
16-Bit
Time-
Base
Two
Select
Bus
16-Bit Register A
16-Bit Register B2
16-Bit Compare A
16-Bit Compare B
Double Action Submodule
Compare
Interrupt
Flip-Flop
Trailing
Output
Output
Edge
on
MOTOROLA
Output
Pin
13-60