MC9S12E256 Datasheet, PDF (344/602 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 11 Pulse Width Modulator with Fault Protection (PMF15B6CV2)
11.3.2.24 PMF Deadtime A Register (PMFDTMA)
Module Base + 0x0026
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R0
0
0
0
W
PMFDTMA
Reset 0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
= Unimplemented or Reserved
Figure 11-30. PMF Deadtime A Register (PMFDTMA)
Read anytime. This register cannot be modified after the WP bit is set.
Table 11-31. PMFDTMA Field Descriptions
Field
Description
11–0
PMFDTMA
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:
DT = P × PMFDTMA – 1, where DT is deadtime, P is the prescaler value, PMFDTMA is the programmed
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 × 5 – 1 = 9 IPbus clock cycles. A special
case exists when the P = 1, then DT = PMFDTMA.
11.3.2.25 PMF Enable Control B Register (PMFENCB)
Module Base + 0x0028
7
6
5
4
3
2
R
0
0
0
0
0
PWMENB
W
Reset
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 11-31. PMF Enable Control B Register (PMFENCB)
1
LDOKB
0
Read anytime and write only if MTG is set.
0
PWMRIEB
0
Table 11-32. PMFENCB Field Descriptions
Field
Description
7
PWMENB
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.
MC9S12E256 Data Sheet, Rev. 1.08
344
Freescale Semiconductor