MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 362
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MC9S12Q
Manufacturer Part Number
MC9S12Q
Description
Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12Q.pdf
(644 pages)
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Chapter 12 Pulse-Width Modulator (PWM8B4C) Block Description
In concatenated mode, writes to the 16-bit counter by using a 16-bit access or writes to either the low- or
high-order byte of the counter will reset the 16-bit counter. Reads of the 16-bit counter must be made by
16-bit access to maintain data coherency.
Read: anytime
Write: anytime (any value written causes PWM counter to be reset to 0x0000).
362
Module Base + 0x000C
Module Base + 0x000D
Module Base + 0x000E
Module Base + 0x000F
Reset
Reset
Reset
Reset
W
W
W
W
R
R
R
R
Bit 7
Bit 7
Bit 7
Bit 7
0
0
0
0
0
0
0
0
7
7
7
7
Writing to the counter while the channel is enabled can cause an irregular
PWM cycle to occur.
Figure 12-15. PWM Channel Counter Registers (PWMCNT0)
Figure 12-16. PWM Channel Counter Registers (PWMCNT1)
Figure 12-17. PWM Channel Counter Registers (PWMCNT2)
Figure 12-18. PWM Channel Counter Registers (PWMCNT3)
6
0
0
6
0
0
6
0
0
6
0
0
6
6
6
6
5
0
0
5
0
0
5
0
0
5
0
0
5
5
5
5
MC9S12Q128
Rev 1.09
NOTE
4
0
0
4
0
0
4
0
0
4
0
0
4
4
4
4
3
0
0
3
0
0
3
0
0
3
0
0
3
3
3
3
2
0
0
2
0
0
2
0
0
2
0
0
2
2
2
2
Freescale Semiconductor
1
0
0
1
0
0
1
0
0
1
0
0
1
1
1
1
Bit 0
Bit 0
Bit 0
Bit 0
0
0
0
0
0
0
0
0
0
0
0
0
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