MC68HC908MR8 Datasheet, PDF (178/372 Pages) Motorola, Inc – Microcontrollers

Pulse-Width Modulator for Motor Control
SEL12 — Top/Bottom Correction Bit for PWM Pair 1 (PWMs 1 and 2)
This buffered read/write bit selects which PWM value register is used
for PWM pins 1 and 2 in complementary mode.
1 = Use PWM value register 2.
0 = Use PWM value register 1.
NOTE: When reading this bit, the value read is the buffer value (not necessarily
the value the output control block is currently using).
SEL34 — Top/Bottom Correction Bit for PWM Pair 2 (PWMs 3 and 4)
This buffered read/write bit selects which PWM value register is used
for PWM pins 3 and 4 in complementary mode.
1 = Use PWM value register 4.
0 = Use PWM value register 3.
NOTE: When reading this bit, the value read is the buffer value (not necessarily
the value the output control block is currently using).
SEL56 — Top/Bottom Correction Bit for PWM Pair 3 (PWMs 5 and 6)
This buffered read/write bit selects which PWM value register is used
for PWM pins 5 and 6 in complementary mode.
1 = Use PWM value register 6.
0 = Use PWM value register 5.
NOTE: When reading this bit, the value read is the buffer value (not necessarily
the value the output control block is currently using).
PRSC1:PRSC0 — PWM Prescaler Bits
These buffered read/write bits allow the PWM clock frequency to be
modified as shown in Table 9-6.
NOTE: When reading these bits, the value read is the buffer value (not
necessarily the value the PWM generator is currently using).
Table 9-6. PWM Prescaler
Prescaler Bits
PRSC1:PRSC0
00
01
10
11
PWM Clock Frequency
f_OP
f_OP/2
f_OP/4
f_OP/8
Technical Data
178
MC68HC908MR8 — Rev 4.1
Pulse-Width Modulator for Motor Control (PWMMC) Freescale Semiconductor