Chapter 8
8-bit Timer
VIII - 30
Simple Pulse Width Measurement
8.7.2
Setup Example
Setup Example of Simple Pulse Width Measurement by 8-bit Timer
Here is an example that Timer 0 measures "Low" pulse width of the input signal of IRQ0.
SYSCLK/2 is selected as a clock source for Timer 0.
The setup procedure and the description of each step are shown below.
The internal enable is set while the sampled signal at the count clock, which is External Interrupt 0 (IRQ0) input,
is "Low" level.
TM0BC starts counting up from "0x00" after the internal enable is set. Timer 0 continues counting up while IRQ0
is "Low", and stops counting up when the sampled signal of IRQ0 becomes "High" level. At the same time,
"Low" period of IRQ0 input can be detected by reading the value of TM0BC in the interrupt process.
Step
Setting
Register
Description
1
Disable the timer counter
TM0MD.TM0EN = 0
Disable the timer count operation.
2
Set the timer mode register
TM0MD.TM0PWM = 0
TM0MD.TM0MOD = 1
Select the pulse width measurement function.
3
TM0MD.TM0CK1-0 = 01
Select the prescaler as the clock source.
4
Set the prescaler
CK0MD.TM0PSC1-0 = X0
CK0MD.TM0BAS = 1
Select SYSCLK/2.
5
Set the compare register
TM0OC = 0xFF
Set the value larger than that of the "Low" period of measured
pulse width.
6
Set the interrupt level
TM0ICR.TM0LV1-0
Refer to [3.1.3 Maskable Interrupt Control Register Setup].
7
Set the interrupt valid edge
IRQ0ICR.REDG0 = 1
Set the external interrupt valid edge.
8
Enable the interrupt
TM0ICR.TM0IE = 1
Enable the external interrupt.
9
Enable the timer counter
TM0MD.TM0EN = 1
Enable the timer count operation.
Содержание MN101L Series
Страница 1: ...Cover MICROCOMPUTER MN101L MN101LR05D 04D 03D 02D LSI User s Manual Pub No 21705 015E ...
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Страница 11: ...Contents Contents 0 ...
Страница 22: ... Contents 11 ...
Страница 23: ...I Chapter 1 Overview 1 ...
Страница 62: ...Chapter 1 Overview I 40 Cautions for Circuit Setup ...
Страница 63: ...II Chapter 2 CPU 2 ...
Страница 94: ...Chapter 2 CPU II 32 Reset ...
Страница 95: ...III Chapter 3 Interrupts 3 ...
Страница 143: ...IV Chapter 4 Clock Mode Voltage Control 4 ...
Страница 175: ...V Chapter 5 Watchdog Timer WDT 5 ...
Страница 180: ...Chapter 5 Watchdog Timer WDT V 6 Operation ...
Страница 181: ...VI Chapter 6 Power Supply Voltage Detection 6 ...
Страница 189: ...VII Chapter 7 I O Port 7 ...
Страница 248: ...Chapter 7 I O Port VII 60 Port 8 ...
Страница 249: ...VIII Chapter 8 8 bit Timer 8 ...
Страница 282: ...Chapter 8 8 bit Timer VIII 34 8 bit Timer Cascade Connection ...
Страница 283: ...IX Chapter 9 16 bit Timer 9 ...
Страница 346: ...Chapter 9 16 bit Timer IX 64 IGBT Output with Dead Time ...
Страница 347: ...X Chapter 10 General Purpose Time Base Free Running Timer 10 ...
Страница 361: ...XI Chapter 11 RTC Time Base Timer RTC TBT 11 ...
Страница 371: ...XII Chapter 12 Real Time Clock RTC 12 ...
Страница 389: ...XIII Chapter 13 Serial Interface 13 ...
Страница 458: ...Chapter 13 Serial Interface XIII 70 IIC Communication ...
Страница 459: ...XIV Chapter 14 DMA Controller 14 ...
Страница 472: ...Chapter 14 DMA Controller XIV 14 DMA Data Transfer ...
Страница 473: ...XV Chapter 15 Buzzer 15 ...
Страница 479: ...XVI Chapter 16 A D Converter ADC 16 ...
Страница 493: ...XVII Chapter 17 LCD 17 ...
Страница 530: ...Chapter 17 LCD XVII 38 LCD Display Examples ...
Страница 531: ...XVIII Chapter 18 ReRAM 18 ...
Страница 538: ...Chapter 18 ReRAM XVIII 8 Command Library ...
Страница 539: ...XIX Chapter 19 On Board Debugger 19 ...
Страница 542: ...Chapter 19 On Board Debugger XIX 4 List of on board debugging functions ...
Страница 543: ...XX Chapter 20 Appendix 20 ...
Страница 555: ...Chapter 20 Appendix Instruction map XX 13 ...