68HC912DG128 Datasheet, PDF (182/424 Pages) Motorola, Inc – Advance Information

Pulse-Width Modulator
PWPERx — PWM Channel Period Registers
Bit 7
6
5
4
3
2
1
Bit 0
PWPER0 Bit 7
6
5
4
3
2
1
Bit 0
$004C
PWPER1 Bit 7
6
5
4
3
2
1
Bit 0
$004D
PWPER2 Bit 7
6
5
4
3
2
1
Bit 0
$004E
PWPER3 Bit 7
6
5
4
3
2
1
Bit 0
$004F
RESET:
1
1
1
1
1
1
1
1
Read and write anytime.
The value in the period register determines the period of the associated
PWM channel. If written while the channel is enabled, the new value will
not take effect until the existing period terminates, forcing the counter to
reset. The new period is then latched and is used until a new period
value is written. Reading this register returns the most recent value
written. To start a new period immediately, write the new period value
and then write the counter forcing a new period to start with the new
period value.
Period = Channel-Clock-Period × (PWPER + 1)
Period = Channel-Clock-Period × (2 × PWPER)
(CENTR = 0)
(CENTR = 1)
PWDTYx — PWM Channel Duty Registers
Bit 7
6
5
4
3
2
1
Bit 0
PWDTY0 Bit 7
6
5
4
3
2
1
Bit 0
$0050
PWDTY1 Bit 7
6
5
4
3
2
1
Bit 0
$0051
PWDTY2 Bit 7
6
5
4
3
2
1
Bit 0
$0052
PWDTY3 Bit 7
6
5
4
3
2
1
Bit 0
$0053
RESET:
1
1
1
1
1
1
1
1
Read and write anytime.
68HC(9)12DG128 Rev 1.0
182
Pulse-Width Modulator
12-pwm
MOTOROLA