MC9S12P128 Datasheet, PDF (342/564 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Pulse-Width Modulator (PWM8B6CV1) Block Description
Read: anytime
Write: anytime (causes the scale counter to load the PWMSCLA value)
10.3.2.10 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.
Clock SB = Clock B / (2 * PWMSCLB)
NOTE
When PWMSCLB = 0x0000, PWMSCLB value is considered a full scale
value of 256. Clock B is thus divided by 512.
Any value written to this register will cause the scale counter to load the new scale value (PWMSCLB).
Module Base + 0x0009
7
6
5
4
3
2
1
0
R
Bit 7
6
5
4
3
2
1
Bit 0
W
Reset
0
0
0
0
0
0
0
0
Figure 10-12. PWM Scale B Register (PWMSCLB)
Read: anytime
Write: anytime (causes the scale counter to load the PWMSCLB value).
10.3.2.11 Reserved Registers (PWMSCNTx)
The registers PWMSCNTA and PWMSCNTB are reserved for factory testing of the PWM module and
are not available in normal modes.
Module Base + 0x000A
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 10-13. Reserved Register (PWMSCNTA)
S12P-Family Reference Manual, Rev. 1.12
342
Freescale Semiconductor