MC68HC705T16 MOTOROLA [Motorola, Inc], MC68HC705T16 Datasheet - Page 68

• Manufacturer Part Number: MC68HC705T16
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: MOTOROLA [Motorola, Inc]

8
is exited. After Stop mode is exited, the PWM output resumes its unfinished portion of the stopped
cycle. In Wait mode, the oscillator is running even though the CPU clock is not present, the PWM
outputs are not affected.
Note:
8.2
The output waveform of the 14-bit PWM channel is controlled by an 8-bit and a 6-bit register. Each
register can be viewed as configuring its own waveform; the final PWM output waveform is a
combination of the two waveforms (waveforms are ORed). The driving clock for the 14-bit PWM
channels is CPU clock.
The 8-bit register works in the same way as the 7-bit PWMs. That is, the value set in this 8-bit
register determines the basic duty cycle of the waveform. A value of $00 results in a continuously
MOTOROLA
8-2
PWM value
$00
$01
$40
$7F
PWM
BRM
T = PWM clock period = 2 Timer clock periods = 8 CPU clock periods =3.81 s if MCU runs at 2.1MHz
Since the 7-bit PWM module uses the 16-bit free-running timer counter, PWM outputs
will be affected when the counter is being reset.
14-Bit PWM Channel
Address
$35
$36
T
9PWM13 9PWM12 9PWM11 9PWM10 9PWM9 9PWM7 9PWM7 9PWM6
bit 7
Figure 8-1 7-Bit PWM Output Waveform
PULSE WIDTH MODULATOR
bit 6
64T
9PWM5 9PWM4 9PWM3 9PWM2 9PWM1 9PWM0
bit 5
487.62 s
bit 4
128T
127T
127T
bit 3
bit 2
64T
bit 1
bit 0
MC68HC05T16
0000 0000
0000 0000
on reset
State
TPG