mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 360

• Manufacturer Part Number: mc9s12q128
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 12 Pulse-Width Modulator (PWM8B4C) Block Description
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).
360
Module Base + 0x0008
Module Base + 0x0009
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)
0
0
5
5
5
5
MC9S12Q128
Rev 1.09
NOTE
NOTE
0
0
4
4
4
4
0
0
3
3
3
3
0
0
2
2
2
2
Freescale Semiconductor
0
0
1
1
1
1
Bit 0
Bit 0
0
0
0
0