Panasonic MN101C00 user manual Subtitle Sub-subtitle, Main text Key information, Summary

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4-3 16-bit Timer Operation (timer 4)

4-3-1 Overview

Timer 4 is a 16-bit programmable counter that can be used as an event counter.

A signal with frequency of 1/2 of the timer 4 overflow signal can be output from the TM4IO pin. An input capture function and added pulse PWM output function can also be used.

■Timer Operation

Settings for timer operation are listed below.

(1)Set the TM4EN flag of the timer 4 mode register (TM4MD) to "0" so that the count operation of timer 4 is stopped.

(2)Set the TM4CK2~0 flags of the TM4MD register to select fosc, fs/4, or fs/16 as the clock source.

(3)Set the TM4PWM flag of the TM4MD register to "0" so that 16-bit timer operation is selected.

Clock

TM4EN

Write to registers

TM4OCH, TM4OCL

Binary	04	05	06	07	08	09	00
counter 4

Figure 4-3-1 Binary Counter 4 (TM4BC) Count Timing

If the TM4EN flag of the TM4MD register is changed simultaneously with other bits, the switching operation may cause binary counter 4 to be incremented.

If the value of TM4OCH and TM4OCL registers is overwritten while timer 4 has stopped counting, binary counter 4 will be reset to X'0000'.

Chapter 4 Timer Functions

When servicing an interrupt, reset the timer 4 interrupt request flag before operating timer 4.

During a count operation, be careful if the value set in TM4OCH and TM4OCL is smaller than the value of binary counter 4, since the count-up operation will continue until overflow occurs.

Summary

Introduction to the section.

Supplementary information

Supplementary information for the main text. An explanation of terminology is also included.

Precautions and warnings

Precautions are listed in case of lost functionality or damage.

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16-bit Timer Operation (timer 4) 83

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