mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 391

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

12.3.2.9
PWMSCLA is the programmable scale value used in scaling clock A to generate clock SA. Clock SA is
generated by taking clock A, dividing it by the value in the PWMSCLA register and dividing that by two.
Any value written to this register will cause the scale counter to load the new scale value (PWMSCLA).
Read: anytime
Write: anytime (causes the scale counter to load the PWMSCLA value)
12.3.2.10 PWM Scale B Register (PWMSCLB)
PWMSCLB is the programmable scale value used in scaling clock B to generate clock SB. Clock SB is
generated by taking clock B, dividing it by the value in the PWMSCLB register and dividing that by two.
Any value written to this register will cause the scale counter to load the new scale value (PWMSCLB).
Read: anytime
Write: anytime (causes the scale counter to load the PWMSCLB value).
Freescale Semiconductor
Reset
Reset
W
W
R
R
Clock SA = Clock A / (2 * PWMSCLA)
Clock SB = Clock B / (2 * PWMSCLB)
Bit 7
Bit 7
PWM Scale A Register (PWMSCLA)
0
0
7
7
When PWMSCLA = 0x0000, PWMSCLA value is considered a full scale
value of 256. Clock A is thus divided by 512.
When PWMSCLB = 0x0000, PWMSCLB value is considered a full scale
value of 256. Clock B is thus divided by 512.
0
0
6
6
6
6
Figure 12-11. PWM Scale A Register (PWMSCLA)
Figure 12-12. PWM Scale B Register (PWMSCLB)
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
5
5
5
NOTE
NOTE
0
0
4
4
4
4
3
0
3
0
3
3
Chapter 12 Pulse-Width Modulator (PWM8B6CV1)
0
0
2
2
2
2
0
0
1
1
1
1
Bit 0
Bit 0
0
0
0
0
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