S9S12P64J0MFT Freescale Semiconductor, S9S12P64J0MFT Datasheet - Page 356
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S9S12P64J0MFT
Manufacturer Part Number
S9S12P64J0MFT
Description
MCU 64K FLASH AUTO 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS12r
Datasheet
1.S9S12P32J0MFT.pdf
(566 pages)
Specifications of S9S12P64J0MFT
Core Processor
HCS12
Core Size
16-Bit
Speed
32MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.72 V ~ 5.5 V
Data Converters
A/D 10x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN Exposed Pad
Processor Series
S12P
Core
HCS12
3rd Party Development Tools
EWHCS12
Development Tools By Supplier
KIT33812ECUEVME, DEMO9S12PFAME
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Pulse-Width Modulator (PWM8B6CV1) Block Description
due to the synchronization of PWMEx and the clock source. An exception to this is when channels are
concatenated. Refer to
On the front end of the PWM timer, the clock is enabled to the PWM circuit by the PWMEx bit being high.
There is an edge-synchronizing circuit to guarantee that the clock will only be enabled or disabled at an
edge. When the channel is disabled (PWMEx = 0), the counter for the channel does not count.
10.4.2.2
Each channel has a polarity bit to allow starting a waveform cycle with a high or low signal. This is shown
on the block diagram as a mux select of either the Q output or the Q output of the PWM output flip-flop.
When one of the bits in the PWMPOL register is set, the associated PWM channel output is high at the
beginning of the waveform, then goes low when the duty count is reached. Conversely, if the polarity bit
is 0, the output starts low and then goes high when the duty count is reached.
10.4.2.3
Dedicated period and duty registers exist for each channel and are double buffered so that if they change
while the channel is enabled, the change will NOT take effect until one of the following occurs:
In this way, the output of the PWM will always be either the old waveform or the new waveform, not some
variation in between. If the channel is not enabled, then writes to the period and duty registers will go
directly to the latches as well as the buffer.
A change in duty or period can be forced into effect “immediately” by writing the new value to the duty
and/or period registers and then writing to the counter. This forces the counter to reset and the new duty
and/or period values to be latched. In addition, because the counter is readable it is possible to know where
the count is with respect to the duty value and software can be used to make adjustments.
10.4.2.4
Each channel has a dedicated 8-bit up/down counter which runs at the rate of the selected clock source
(reference
a duty register and a period register as shown in
register the output flip-flop changes state causing the PWM waveform to also change state. A match
356
•
•
•
The effective period ends
The counter is written (counter resets to 0x0000)
The channel is disabled
Figure 10-34
PWM Polarity
PWM Period and Duty
PWM Timer Counters
The first PWM cycle after enabling the channel can be irregular.
When forcing a new period or duty into effect immediately, an irregular
PWM cycle can occur.
Depending on the polarity bit, the duty registers will contain the count of
either the high time or the low time.
Section 10.4.2.7, “PWM 16-Bit Functions,”
for the available clock sources and rates). The counter compares to two registers,
S12P-Family Reference Manual, Rev. 1.13
Figure
NOTE
NOTE
10-35. When the PWM counter matches the duty
for more detail.
Freescale Semiconductor
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