CONFIG TIMER2

Action

Configure TIMER2.

 

 

Syntax for the 8535

CONFIG TIMER2 = 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]

 

Syntax for the M103

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]

 

 

Remarks

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.

 

 

Here is the effect of the various options.

EDGE	You can select whether the TIMER will count on the falling or rising edge. Only for COUNTER mode.

 

 

PRESCALE

The TIMER is connected to the system clock in this case. You can select the division of the system clock with this parameter.   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.

 

 

 

The TIMER2 also has a compare registers

 

When the timer value matches a compare register, an action can be performed

COMPARE

The action can be:   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

 

 

And the TIMER can be used in 8 bit PWM mode

 

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

 

COMPARE PWM

PWM compare mode. Can be CLEAR_UP or CLEAR_DOWN

 

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.

 

 

Example

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

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