MC9S12XDP512MAG Freescale, MC9S12XDP512MAG Datasheet - Page 380
MC9S12XDP512MAG
Manufacturer Part Number
MC9S12XDP512MAG
Description
Manufacturer
Freescale
Datasheet
1.MC9S12XDP512MAG.pdf
(1348 pages)
Specifications of MC9S12XDP512MAG
Cpu Family
HCS12
Device Core Size
16b
Frequency (max)
40MHz
Interface Type
CAN/I2C/SCI/SPI
Total Internal Ram Size
32KB
# I/os (max)
119
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
2.5/5V
Operating Supply Voltage (max)
2.75/5.5V
Operating Supply Voltage (min)
2.35/3.15V
On-chip Adc
2(24-chx10-bit)
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
144
Package Type
LQFP
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)
8.4
8.4.1
There are four available clocks: clock A, clock B, clock SA (scaled A), and clock SB (scaled B). These
four clocks are based on the bus clock.
Clock A and B can be software selected to be 1, 1/2, 1/4, 1/8,..., 1/64, 1/128 times the bus clock. Clock SA
uses clock A as an input and divides it further with a reloadable counter. Similarly, clock SB uses clock B
as an input and divides it further with a reloadable counter. The rates available for clock SA are software
selectable to be clock A divided by 2, 4, 6, 8,..., or 512 in increments of divide by 2. Similar rates are
available for clock SB. Each PWM channel has the capability of selecting one of two clocks, either the
pre-scaled clock (clock A or B) or the scaled clock (clock SA or SB).
The block diagram in
380
PWMRSTRT
PWM7ENA
PWM7INL
PWMLVL
PWM7IN
PWMIF
PWMIE
Field
7
6
5
4
2
1
0
Functional Description
PWM Clock Select
PWM Interrupt Flag — Any change from passive to asserted (active) state or from active to passive state will
be flagged by setting the PWMIF flag = 1. The flag is cleared by writing a logic 1 to it. Writing a 0 has no effect.
0 No change on PWM7IN input.
1 Change on PWM7IN input
PWM Interrupt Enable — If interrupt is enabled an interrupt to the CPU is asserted.
0 PWM interrupt is disabled.
1 PWM interrupt is enabled.
PWM Restart — The PWM can only be restarted if the PWM channel input 7 is de-asserted. After writing a logic
1 to the PWMRSTRT bit (trigger event) the PWM channels start running after the corresponding counter passes
next “counter == 0” phase. Also, if the PWM7ENA bit is reset to 0, the PWM do not start before the counter
passes $00. The bit is always read as “0”.
PWM Shutdown Output Level If active level as defined by the PWM7IN input, gets asserted all enabled PWM
channels are immediately driven to the level defined by PWMLVL.
0 PWM outputs are forced to 0
1 Outputs are forced to 1.
PWM Channel 7 Input Status — This reflects the current status of the PWM7 pin.
PWM Shutdown Active Input Level for Channel 7 — If the emergency shutdown feature is enabled
(PWM7ENA = 1), this bit determines the active level of the PWM7channel.
0 Active level is low
1 Active level is high
PWM Emergency Shutdown Enable — If this bit is logic 1, the pin associated with channel 7 is forced to input
and the emergency shutdown feature is enabled. All the other bits in this register are meaningful only if
PWM7ENA = 1.
0 PWM emergency feature disabled.
1 PWM emergency feature is enabled.
Figure 8-18
Table 8-9. PWMSDN Field Descriptions
shows the four different clocks and how the scaled clocks are created.
MC9S12XDP512 Data Sheet, Rev. 2.21
Description
Freescale Semiconductor
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