CONFIG TIMER2 - Revision history

Admin: Created page with "= Action = Configure TIMER2. =
2013-02-08T11:40:03Z

Created page with "= <span class="f_Header">Action</span> = Configure TIMER2. <span style="font-family: Arial;"> </span> <span style="font-family: Arial;"> </span> = <span class="f..."

New page
= <span class="f_Header">Action</span> =

Configure TIMER2.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

= <span class="f_Header">Syntax for the 8535</span> =

<span class="f_Syntax">CONFIG TIMER2 </span>= TIMER | PWM , ASYNC=ON |OFF,

PRESCALE = 1 | 8 | 32 | 64 | 128 | 256 | 1024 ,

COMPARE = CLEAR | SET | TOGGLE | DISCONNECT ,

PWM = ON | OFF ,

COMPARE_PWM = CLEAR_UP| CLEAR_DOWN | DISCONNECT ,

CLEAR_TIMER = 1|0

[,CONFIGURATION=NAME]

<span style="font-family: Arial;"> </span>

= <span class="f_Header">Syntax for the M103</span> =

CONFIG TIMER2 = COUNTER| TIMER | PWM ,

EDGE= FALLING |RISING,

PRESCALE = 1 | 8 | 64 | 256 | 1024 ,

COMPARE = CLEAR | SET | TOGGLE | DISCONNECT ,

PWM = ON | OFF ,

COMPARE_PWM = CLEAR UP| CLEAR DOWN | DISCONNECT ,

CLEAR _TIMER = 1|0

[,CONFIGURATION=NAME]

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

= <span class="f_Header">Remarks</span> =

The TIMER2 is an 8 bit counter.

It depends on the chip if it can work as a counter or not.

The syntax shown above must be on one line. Not all the options need to be selected.

Some chips support multiple COMPARE outputs. Use COMPARE_A, COMPARE_B, COMPARE_C , etc.

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

Here is the effect of the various options.
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="604" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
| valign="top" width="19%" style="width: 111px; border: 1px solid rgb(0, 0, 0);" |
EDGE

| valign="top" width="100%" style="width: 484px; border: 1px solid rgb(0, 0, 0);" |
You can select whether the TIMER will count on the falling or rising edge. Only for COUNTER mode.

|}
</div>
<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="604" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
| valign="top" width="19%" style="width: 111px; border: 1px solid rgb(0, 0, 0);" |
PRESCALE

| valign="top" width="100%" style="width: 484px; border: 1px solid rgb(0, 0, 0);" |
The TIMER is connected to the system clock in this case. You can select the division of the system clock with this parameter.

<span style="font-family: Arial;"> </span>

Valid values are 1 , 8, 64, 256 or 1024

or

1 , 8, 32 , 64 , 256 or 1024 for the M103

 

Prescale can not be used in COUNTER mode.

|}
</div>
<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

The TIMER2 also has a compare registers

<span style="font-family: Arial;"> </span>

When the timer value matches a compare register, an action can be performed
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="604" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
| valign="top" width="25%" style="width: 147px; border: 1px solid rgb(0, 0, 0);" |
COMPARE

| valign="top" width="100%" style="width: 448px; border: 1px solid rgb(0, 0, 0);" |
The action can be:

<span style="font-family: Arial;"> </span>

SET will set the OC2 pin

CLEAR will clear the OC2 pin

TOGGLE will toggle the OC2 pin

DISCONNECT will disconnect the TIMER from output pin OC2

|}
</div>
<span style="font-family: Arial;"> </span>

<span style="font-family: Arial;"> </span>

And the TIMER can be used in 8 bit PWM mode

<span style="font-family: Arial;"> </span>

You can specify if the counter must count UP or down after a match to the compare registers

<span style="font-family: Arial;"> </span>
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="604" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
| valign="top" width="28%" style="width: 165px; border: 1px solid rgb(0, 0, 0);" |
COMPARE PWM

| valign="top" width="100%" style="width: 430px; border: 1px solid rgb(0, 0, 0);" |
PWM compare mode.

Can be CLEAR_UP or CLEAR_DOWN

|}
</div>
<span style="font-family: Arial;"> </span>

CONFIGURATION is optional. When you add configuration=mysetting, you can use this setting when you start the timer : START TIMER0 , mysetting

If you have multiple settings, you can start the timer with these different settings.

 

<span style="font-family: Arial;"> </span>

= <span class="f_Header">Example</span> =

<br/><source lang="bascomavr">
Dim W As Byte
Config Timer2 = Timer , ASYNC = 1 , Prescale = 128
On TIMER2 Myisr
ENABLE INTERRUPTS
ENABLE TIMER2
DO

LOOP

MYISR:
'get here every second with a 32768 Hz xtal
RETURN

'You can read or write to the timer with the COUNTER2 or TIMER2 variable
W = Timer2
Timer2 = W
</source><br/>{{Languages}}

[[Category:BASCOM Language Reference]]