S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 19 Pulse-Width Modulator (S12PWM8B8CV1)
Write: Unimplemented in normal modes
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
NOTE
Writing to this register when in special modes can alter the PWM
functionality.
19.3.2.9
PWM Scale A Register (PWMSCLA)
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.
Clock SA = Clock A / (2 * PWMSCLA)
NOTE
When PWMSCLA = $00, PWMSCLA value is considered a full scale value
of 256. Clock A is thus divided by 512.
Any value written to this register will cause the scale counter to load the new scale value (PWMSCLA).
Module Base + 0x0008
7
6
5
4
3
2
1
0
R
W
Reset
Bit 7
0
6
0
5
0
4
0
3
0
2
0
1
0
Bit 0
0
Figure 19-11. PWM Scale A Register (PWMSCLA)
Read: Anytime
Write: Anytime (causes the scale counter to load the PWMSCLA value)
19.3.2.10 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).
Module Base + 0x0009
7
6
5
4
3
2
1
0
R
W
Reset
Bit 7
0
6
0
5
0
4
0
3
0
2
0
1
0
Bit 0
0
Figure 19-12. PWM Scale B Register (PWMSCLB)
MC9S12XE-Family Reference Manual , Rev. 1.19
704
Freescale Semiconductor
