Remote-processing RPC-220 Manuel d'utilisateur télécharger pdf (Page 31)

COUNTER/TIMERS SECTION 8

Page 8-2

TIMER 2

Timer 2 is used to m easure time between edges, genera te

timed interrupts, or set, clear, and toggle certain bits at

timed intervals. CP U port P1 (located on J3 and shared

with the LCD display port) and P4 are mostly used for

this purpose.

Timer 2 can use an external (at CP U port P1. 4) or

internal clock. The internal clock frequency is 1.8432

Mhz. and can be divided down via TM2CON register.

Review 8XC552OV.PDF file for more timer 2

information. Text starts on the second page (3-474).

AN418. PDF is an application note for timer 2.

NOTE: There is an err or in the 8X C552O V. PDF data

file. Figures 6 and 7 are in error. The RTE

a match to CM1, not CM2. The STE register

in Figur e 7 sets bits P4. 0 to P4. 5 on a match to

CM1, not CM2.

APPLICATION PROGRAMS

The following programs are in the subdirectory as

shown. All programs can use the RTC output for

counting and pulse width m easurement to tr y them out.

See SECTION 7, SQUAR E WAVE OU TPUT for

generating information.

The programs list the input and control lines.

File name Description

timer0\timer0a.c Timer 0 in counter mode.

Displays current count using J3-19

input.

timer0\timer0b.c Timer 0 in timing mode.

Measures high pulse time (35 ms

maximum) at J3-6.

timer2\timer2a.c Timer 2 used to generate timed

interrupts. Can also u se to

generate timed pulse outputs.

timer2\timer2b.c Measure pulse widths (rising edge

to rising edge). Prints ou t time in

micro-seconds.

timer2\timer2c.c Measure positive pulse width.

Faster interrupt routine for shorter

pulses. Prints out number of

counter ticks.

timer2\timer2d.c Outputs delayed pulses. Need

oscilloscope to view.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 46 47

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Remote-processing RPC-220 Manuel d'utilisateur Page 31

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