MC9S12XD256MAL Datasheet, PDF (376/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)
R
W
Reset
7
Bit 7
0
6
5
4
3
2
6
5
4
3
2
0
0
0
0
0
Figure 8-11. PWM Scale A Register (PWMSCLA)
Read: Anytime
Write: Anytime (causes the scale counter to load the PWMSCLA value)
1
0
1
Bit 0
0
0
8.3.2.10 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 = $00, 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).
R
W
Reset
7
Bit 7
0
6
5
4
3
2
6
5
4
3
2
0
0
0
0
0
Figure 8-12. PWM Scale B Register (PWMSCLB)
Read: Anytime
Write: Anytime (causes the scale counter to load the PWMSCLB value).
1
0
1
Bit 0
0
0
8.3.2.11 Reserved Registers (PWMSCNTx)
The registers PWMSCNTA and PWMSCNTB are reserved for factory testing of the PWM module and are
not available in normal modes.
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 8-13. Reserved Registers (PWMSCNTx)
Read: Always read $00 in normal modes
Write: Unimplemented in normal modes
MC9S12XDP512 Data Sheet, Rev. 2.21
376
Freescale Semiconductor