mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 344

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 11 Pulse Width Modulator with Fault Protection (PMF15B6CV2)
11.3.2.24 PMF Deadtime A Register (PMFDTMA)
Read anytime. This register cannot be modified after the WP bit is set.
11.3.2.25 PMF Enable Control B Register (PMFENCB)
Read anytime and write only if MTG is set.
344
Module Base + 0x0026
Module Base + 0x0028
PMFDTMA
PWMENB
Reset
Reset
Field
Field
11–0
7
W
W
R
R
PWMENB
15
0
0
PMF Deadtime A Bits — The 12-bit value written to this register is the number of PWM clock cycles in
complementary channel operation. A reset sets the PWM deadtime register to a default value of 0x0FFF,
selecting a deadtime of 256-PWM clock cycles minus one bus clock cycle.
Note: Deadtime is affected by changes to the prescaler value. The deadtime duration is determined as follows:
PWM Generator B Enable — If MTG is clear, this bit reads zero and cannot be written.
If MTG is set, this bit when set enables the PWM generator B and the PWM2 and PWM3 pins. When PWMENB
is clear, PWM generator B is disabled, and the PWM2 and PWM3 pins are in their inactive states unless the
OUTCTL2 and OUTCTL3 bits are set.
0 PWM generator B and PWM2–3 pins disabled unless the respective OUTCTL bit is set.
1 PWM generator B and PWM2–3 pins enabled.
0
7
= Unimplemented or Reserved
14
0
0
DT = P
value of dead time. For example: if the prescaler is programmed for a divide-by-two and the PMFDTMA is
set to five, then P = 2 and the deadtime value is equal to DT = 2
case exists when the P = 1, then DT = PMFDTMA.
= Unimplemented or Reserved
13
0
0
Figure 11-31. PMF Enable Control B Register (PMFENCB)
PMFDTMA – 1, where DT is deadtime, P is the prescaler value, PMFDTMA is the programmed
0
0
6
Figure 11-30. PMF Deadtime A Register (PMFDTMA)
12
0
0
Table 11-31. PMFDTMA Field Descriptions
Table 11-32. PMFENCB Field Descriptions
11
1
MC9S12E256 Data Sheet, Rev. 1.08
0
0
5
10
1
1
9
0
0
4
1
8
Description
Description
1
7
3
0
0
PMFDTMA
1
6
1
5
5 – 1 = 9 IPbus clock cycles. A special
0
0
2
4
1
1
3
LDOKB
Freescale Semiconductor
0
1
1
2
PWMRIEB
1
1
0
0
1
0