MC68HC708MP16 Datasheet, PDF (154/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Pulse Width Modulator for Motor Control (PWMMC)
PWM1
PWM2
POSITIVE
CURRENT
NEGATIVE
CURRENT
VOLTAGE
SENSOR
IS1 PIN
D
Q
DT1
PWM1
CLK
D
Q
DT2
PWM2
CLK
Figure 9-22. DTx bits
9.6.3.2 Automatic Correction
The current sense pin, ISx, for a PWM pair selects either the odd or the
even PWM value registers to use in the next PWM cycle. The selection
is based on user-provided current sense circuitry driving the ISx pin high
for negative current and low for positive current.
Table 9-6. Top/Bottom Current-Sense Correction
Pin
Logic State
0
IS1
1
0
IS2
1
0
IS3
1
Output Control
PMVAL1 controls PWM1/PWM2 pair
PMVAL2 controls PWM1/PWM2 pair
PMVAL3 controls PWM3/PWM4 pair
PMVAL4 controls PWM3/PWM4 pair
PMVAL5 controls PWM5/PWM6 pair
PMVAL6 controls PWM5/PWM6 pair
Technical Data
154
MC68HC708MP16 — Rev. 3.1
Pulse Width Modulator for Motor Control (PWMMC) Freescale Semiconductor