Hi Thomas and list,
That was it. Thanks so much! I knew it had to be something simple I=20
wasn't even thinking about.
Rob


On 1/31/2012 1:54 PM, Thomas Sefranek wrote:
> You DO realize there are registers NOT in the access page, right?
>
> Example code:
> ;
> ; Timer 5 is used as the time base for CCP5 to trigger the A-D. (30.5 Hz.=
)
> ;----- T5CON Bits -------------------------------------------------------=
--
> Init_TMR5	MOVLW	0X30
> ;		BCF	T5CON, TMR5CS1	;<7>  Timer 5 clock source is Fosc/4.
> ;		BCF	T5CON, TMR5CS0	;<6>  Timer 5 clock source is Fosc/4.
> ;		BSF	 T5CON, T5CKPS1	;<5>  Prescale 1:8.
> ;		BSF	 T5CON, T5CKPS0	;<4>  Prescale 1:8.
> ;		BCF	T5CON, T5SOSCEN	;<3>  Timer 5 oscillator off.
> ;		BCF	T5CON, NOT_T5SYNC	;<2>  Unused. (Using internal clock.)
> ;		BCF	T5CON, T5RD16	;<1>  Read timer 5 as 2 bytes.
> ;		BCF	T5CON, TMR5ON	;<0>  Disable Timer 5.
> 		MOVFF	WREG, T5CON
> ; New in the K22
> 		MOVFF	PMD0, WREG		; Fetch the current Power control register 0.
> 		BCF	WREG, TMR5MD	; Power on TIMER 5.
> 		MOVFF	WREG, PMD0		; Save the adjusted Power control register 0.
> ;
> ;----- T5GCON Bits -----------------------------------------------------
> Init_T5G	CLRF	WREG
> ;		BCF	T5GCON, TMR5GE	;<7>  No gate function.
> ;		BCF	T5GCON, T5GPOL	;<6>  Gate is active LOW.
> ;		BCF	T5GCON, T5GTM	;<5>  Gate mode disabled.
> ;		BCF	T5GCON, T5GSPM	;<4>  Single pulse mode disabled.
> ;		BCF	T5GCON, T5GGO_NOT_DONE	;<3>  Timer 5 gate complete.
> ;		BCF	T5GCON, T5GSS1	;<1>  Timer 5 gate pin,
> ;		BCF	T5GCON, T5GSS0	;<0>  Source.
> 		MOVFF	WREG, T5GCON
> ;
> On Jan 31, 2012, at 4:42 PM, Rob wrote:
>
>> Hello List,
>>    I'm using a PIC18F26K22 with assembly and trying to use Timer 5 as a
>> simple timer that generates an interrupt on rollover.  In my application
>> I am also using Timer 0,1 and 3 without problems. I basically duplicated
>> the code I'm using for Timer 3 with relevant register changes and just
>> can't seem to get Timer 5 to generate an interrupt. Is there something
>> special about the way Timer 5 needs to be configured that is unique from
>> say Timer 3? In the low level ISR code, I basically just use the
>> interrupt to set a flag that I check in my main loop. Below is the code
>> I am using to try to configure Timer 5:
>>
>>      clrf    TMR5H            ;clear high byte of Timer5 16 bit register=
s
>>      clrf    TMR5L            ;then clear low byte which reloads both
>> registers
>>      bcf        PMD0,TMR5MD        ;Timer5 Peripheral Module Disable
>> Control bit
>>      bcf        T5CON,TMR5ON    ;1=3DEnables Timer5 (initialize as disab=
led)
>>      bcf        T5GCON,TMR5GE    ;Timer1/3/5 Gate Enable bit (0=3Dcounts
>> regardless of gate)
>>      bcf        T5GCON,T5GPOL    ;Timer1/3/5 Gate Polarity bit
>>      bcf        T5GCON,T5GSPM    ;Timer1/3/5 Gate Single-Pulse Mode b
>>      bcf        T5GCON,T5GSS1    ;Timer1/3/5 Gate Source Select bits
>>      bcf        T5GCON,T5GSS0    ;Timer1/3/5 Gate Source Select bits
>>      bsf        T5CON,T5RD16    ;1=3DEnables register read/write of Time=
r5
>> in one 16-bit operation
>>      bsf        T5CON,T5CKPS1    ;Timer5 Input Clock Prescale Select bit=
s
>>      bsf        T5CON,T5CKPS0    ;11 =3D 1:8 Prescale value
>>      bcf        T5CON,TMR5CS1    ;Timer1/3/5 Clock Source Select bits
>>      bcf        T5CON,TMR5CS0    ;Timer1/3/5 Clock Source Select bits
>>      bcf        T5CON,T5SOSCEN    ;Dedicated Secondary oscillator
>> circuit disabled
>>      bcf        T5CON,T5SYNC    ;Timer1/3/5 External Clock Input
>> Synchronization Control bit
>>      bcf        IPR5,TMR5IP        ;TMR5 Overflow Interrupt Priority
>> bit. 1=3DHigh, 0=3DLow
>>      bcf        PIE5,TMR5IE        ;TMR5 Overflow Interrupt Enable bit.
>> 1=3DEnable
>>      bcf        PIE3,TMR5GIE    ;TMR5 Gate Interrupt Enable bit. 1=3DEna=
ble
>>      bcf        PIR5,TMR5IF        ;TMR5 Overflow Interrupt Flag bit.
>> (must be cleared by software)
>>
>> ;make all defined interrupts active now
>>      bsf        INTCON,GIEH        ;Enables all high priority interrupts
>>      bsf        INTCON,GIEL        ;Enables all low priority peripheral
>> interrupts
>>
>> Then later I call a subroutine that enables the timer"
>>
>>      bcf        PIE5,TMR5IE        ;first, disable TMR5 Overflow
>> Interrupt in case it's running
>>      clrf    TMR5H            ;clear high byte of Timer5
>>      clrf    TMR5L            ;then clear low byte which reloads both
>> registers
>>      bsf        T5CON,TMR5ON    ;Enables Timer5
>>      bsf        PIE5,TMR5IE        ;enable TMR5 Overflow Interrupt
>>
>> Hope this is enough info so reveal my error. It must just be something
>> simple that I'm over-looking but I've tried everything I can think of...
>>
>> Thanks,
>> Rob
>>
>> --=20
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>    *
>    |  __O    Thomas C. Sefranek  wa1rhp@comcast.net
>    |_-\<,_   Amateur Radio Operator: WA1RHP
>    (*)/ (*)  Bicycle mobile on 145.41 MHz.
>
> ARRL Instructor, Technical Specialist, VE Contact.
>
> http://www.harvardrepeater.org
>
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