AVR-Chat

This AVR newbie is using a tiny2313 and studio 4.11.

I have timer1 configured for CTC with OCR1A.   OCIE1A is set in TIMSK.  
Global interrupts are enabled.  Stepping thru the code in the simulator 
shows OCF1A being set for 1 cycle but my interrupt vector is not being 
jumped to.   My code is not clearing OCF1A and the datasheet says that 
OCF1A will not be cleared until execution of the interrup vector.  Any 
thoughts on what I am doing wrong?  Code below.

Thanks,
Aaron

; configure Timer/Counter1
    ldi temp1,  0b00000000
                ; 00------  ; Compare Output Mode for Channel A, Normal 
Port Operation, OC1A & OC1B disconnected
                ; --00----  ; Compare Output Mode for Channel B, Normal 
Port Operation, OC1A & OC1B disconnected
                ; ----00--  ; reserved
                ; ------00  ; 00 = clear timer on compare match with OCR1A
    out TCCR1A, temp1

    ldi temp1,  0b00001001
                ; 0-------  ; 0 = input capture noise canceler disabled
                ; -0------  ; 0 = trigger capture on falling edge of IC1
                ; --0-----  ; reserved
                ; ---01---  ; 01 = clear timer on compare match with OCR1A
                ; -----001  ; 001 = no prescaler, internal clock
                ; -----011  ; 011 = 1:64 prescaler, internal clock
    out TCCR1B, temp1

    ldi temp1,  0b00000000
                ; 0-------  ; 1 = force output compare for channel A
                ; -0------  ; 1 = force output compare for channel B
                ; --000000  ; reserved
    out TCCR1C, temp1
   
    cli                     ; clear interrupts for 16-bit register access
   
    ldi temp1, 0x1F         ; 8Mhz clock -> 125 ns instruction cycle
    ldi temp2, 0x40         ; ...for a 1 ms delay we need 8000 
instruction cycles
    out OCR1AH, temp1       ; ...8000 decimal = 0x1F40
    out OCR1AL, temp2
   
    sei                     ; enable interrupts after 16-bit register access

    ldi temp1,  0b01000000
                ; 0-------  ; 0 = Timer/Counter1 Overflow Interrupt Disabled
                ; -1------  ; 1 = Timer/Counter1 Output Compare A Match 
Interrupt Enabled
                ; --0-----  ; 0 = Timer/Counter1 Output Compare B Match 
Interrupt Disabled
                ; ---0----  ; reserved
                ; ----0---  ; 0 = Timer/Counter1 Input Capture Interrupt 
Disabled
                ; -----0--  ; 0 = Timer/Counter0 Output Compare B Match 
Interrupt Disabled
                ; ------0-  ; 0 = Timer/Counter0 Overflow Interrupt Disabled
                ; -------0  ; 0 = Timer/Counter0 Output Compare A Match 
Interrupt Disabled

    out TIMSK, temp1

Loop:
   nop
   nop
   nop
   nop
   nop
   rjmp Loop