S9S12G96F0VLH Freescale Semiconductor, S9S12G96F0VLH Datasheet - Page 654
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S9S12G96F0VLH
Manufacturer Part Number
S9S12G96F0VLH
Description
16-bit Microcontrollers - MCU 16BIT 96K FLASH
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12G96F0VLH
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
96 KB
Data Ram Size
8192 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-64
Mounting Style
SMD/SMT
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S9S12G96F0VLH
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Pulse-Width Modulator (S12PWM8B8CV2)
Clock A is used as an input to an 8-bit down counter. This down counter loads a user programmable scale
value from the scale register (PWMSCLA). When the down counter reaches one, a pulse is output and the
8-bit counter is re-loaded. The output signal from this circuit is further divided by two. This gives a greater
range with only a slight reduction in granularity. Clock SA equals clock A divided by two times the value
in the PWMSCLA register.
Similarly, clock B is used as an input to an 8-bit down counter followed by a divide by two producing clock
SB. Thus, clock SB equals clock B divided by two times the value in the PWMSCLB register.
As an example, consider the case in which the user writes $FF into the PWMSCLA register. Clock A for
this case will be E (bus clock) divided by 4. A pulse will occur at a rate of once every 255x4 E cycles.
Passing this through the divide by two circuit produces a clock signal at an E divided by 2040 rate.
Similarly, a value of $01 in the PWMSCLA register when clock A is E divided by 4 will produce a clock
at an E divided by 8 rate.
Otherwise, when changing rates the counter would have to count down to $01 before counting at the proper
rate. Forcing the associated counter to re-load the scale register value every time PWMSCLA or
PWMSCLB is written prevents this.
19.4.1.3
Each PWM channel has the capability of selecting one of four clocks, clock A, clock SA, clock B or clock
SB. The clock selection is done with the PCLKx control bits in the PWMCLK register and PCLKABx
control bits in PWMCLKAB register. For backward compatibility consideration, the reset value of
PWMCLK and PWMCLKAB configures following default clock selection.
656
Writing to PWMSCLA or PWMSCLB causes the associated 8-bit down counter to be re-loaded.
Clock Select
Clock SA = Clock A / (2 * PWMSCLA)
When PWMSCLA = $00, PWMSCLA value is considered a full scale value
of 256. Clock A is thus divided by 512.
Clock SB = Clock B / (2 * PWMSCLB)
When PWMSCLB = $00, PWMSCLB value is considered a full scale value
of 256. Clock B is thus divided by 512.
Writing to the scale registers while channels are operating can cause
irregularities in the PWM outputs.
For channels 0, 1, 4, and 5 the clock choices are clock A.
For channels 2, 3, 6, and 7 the clock choices are clock B.
Changing clock control bits while channels are operating can cause
irregularities in the PWM outputs.
MC9S12G Family Reference Manual,
NOTE
NOTE
NOTE
NOTE
Rev.1.23
Freescale Semiconductor
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