Panasonic MN101L Series

Chapter 9
16-bit Timer
IX - 38 16-bit High-Precision PWM Output (with Continuously Variable Period/Duty)
9.7.2 Setup Example
 High Precision PWM Output Setup Example
Here is an example that, using Timer 7, the PWM output waveform with the 1/4 duty cycle and 400 Hz is output
from TM7IO output pin. HCLK/2 (at f
HCLK
= 8 MHz) is selected as a clock source.
The setup procedure and its description are shown below.
Figure:9.7.4 Output Waveform of TM7IO output pin
Step Setting Register Description
1 Disable the timer counter TM7MD.TM7EN = 0 Disable the timer count operation.
2 Select the timer output pin TMIOEN1.TM7OEN = 1 Select the timer output pin.
[Chapter 7 I/O Port]
3 P0DIR.P0DIR4 = 1
4 Set the timer mode register TM7MD2.TM7PWM = 1 Select the PWM output.
5
TM7MD2.TM7BCR = 1
TM7MD2.T7PWMSL = 1
Select the TM7BC clear source and the duty determination
source of PWM output.
6
TM7MD1.TM7CK1-0 = 00
TM7MD1.TM7PS1-0 = 01
Select HCLK/2 as the count clock source.
7
Set the PWM cycle TM7PR1 = 0x270F Set the cycle PWM output.
Setup value: 10000 - 1 = 9999 (0x270F)
8
Set the "High" period of PWM TM7PR2 = 0x09C3 Set the "High" period of PWM output.
Setup value: 10000 / 4 - 1 = 2499 (0x09C3)
9 Enable the timer counter TM7MD1.TM7EN = 1 Enable the timer count operation.
TM7IO output
400 Hz