MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 548

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Pulse-Width Modulator (S12PWM8B8CV2)
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)
17.3.2.9
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).
17.3.2.10 PWM Channel Counter Registers (PWMCNTx)
Each channel has a dedicated 8-bit up/down counter which runs at the rate of the selected clock source.
The counter can be read at any time without affecting the count or the operation of the PWM channel. In
left aligned output mode, the counter counts from 0 to the value in the period register - 1. In center aligned
output mode, the counter counts from 0 up to the value in the period register and then back down to 0.
Any value written to the counter causes the counter to reset to $00, the counter direction to be set to up,
the immediate load of both duty and period registers with values from the buffers, and the output to change
548
Reset
Reset
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
W
W
R
R
Clock SB = Clock B / (2 * PWMSCLB)
Bit 7
Bit 7
PWM Scale B Register (PWMSCLB)
0
0
7
7
When PWMSCLA = $00, PWMSCLA value is considered a full scale value
of 256. Clock A is thus divided by 512.
When PWMSCLB = $00, PWMSCLB value is considered a full scale value
of 256. Clock B is thus divided by 512.
0
0
6
6
6
6
Figure 17-10. PWM Scale A Register (PWMSCLA)
Figure 17-11. PWM Scale B Register (PWMSCLB)
MC9S12G Family Reference Manual,
5
0
5
0
5
5
NOTE
NOTE
0
0
4
4
4
4
0
0
3
3
3
3
Rev.1.01
2
0
2
0
2
2
Freescale Semiconductor
0
0
1
1
1
1
Bit 0
Bit 0
0
0
0
0