参数资料
型号: MC68HC05T16B
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封装: PLASTIC, SDIP-56
文件页数: 94/128页
文件大小: 734K
代理商: MC68HC05T16B
MOTOROLA
8-2
MC68HC05T16
PULSE WIDTH MODULATOR
8
is exited. After Stop mode is exited, the PWM output resumes its unnished 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:
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.
8.2
14-Bit PWM Channel
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 conguring its own waveform; the nal 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
Figure 8-1 7-Bit PWM Output Waveform
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
BRM
$35
9PWM5
9PWM4
9PWM3
9PWM2
9PWM1
9PWM0
0000 0000
PWM
$36
9PWM13 9PWM12 9PWM11 9PWM10 9PWM9
9PWM7
9PWM6
0000 0000
$00
487.62
s
$01
$40
$7F
128T
127T
64T
127T
T
T = PWM clock period = 2 Timer clock periods = 8 CPU clock periods =3.81
s if MCU runs at 2.1MHz
PWM value
TPG
66
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