CHAPTER 5 TIME-BASE TIMER

5.4Interrupt of Time-base Timer

The time-base timer counter generates an interrupt when the specified bit of the counter overflows (interval timer function).

■Interrupts when the Interval Timer Function is Enabled

The counter counts up with the internal count clock. When the specified interval timer bit overflows, the overflow interrupt request flag bit (TBTC: TBOF) is set to "1". Then if the interrupt request enable bit is enabled (TBTC: TBIE = 1), an interrupt request (IRQ7) is sent to the CPU. When this occurs, use the interrupt handling routine and set the TBOF bit to "0" to clear the interrupt request. The TBOF bit is set to "1" when the specified bit overflows regardless of the value of the TBIE bit.

Note:

When the interrupt request is allowed to be output (TBIE = 1) after a reset is released, clear the TBOF bit (TBOF = 0) at the same time.

Note:

•An interrupt request is generated immediately after the TBIE bit is set from 0 (disable) to 1 (enable) if the TBOF bit is "1".

•When the counter is cleared (TBTC: TBR = 0) and the specified bit overflows at the same time, the TBOF bit is not set.

■Oscillation Stabilization Time and Time-base Timer Interrupts

If a time interval is set the time shorter than the oscillation stabilization time, the interval interrupt request (TBTC: TBOF = 1) is generated from the time-base timer upon the start of normal mode. In this case, interrupts from the time-base timer must be disabled (TBTC: TBIE = 0) when switching to stop mode in which an oscillation is stopped.

■Register and Vector Table Related to Interrupts from Time-base Timer

Table 5.4-1 Register and Vector Table Related to Time-base Timer Interrupts

 

Interrupt level setting register

Address of vector table

Interrupt name

 

 

 

 

 

Register

Bits to be set

High-order

Low-order

 

 

 

 

 

 

 

IRQ7

ILR2 (007CH)

L71 (bit7)

L70 (bit6)

FFECH

FFEDH

 

 

 

 

 

 

See Section "3.4.2 Steps in the Interrupt Operation " for details on interrupt operations.

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Fujitsu F202RA, MB89202 manual Interrupt of Time-base Timer, Ffec H Ffed H
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F202RA, MB89202 specifications

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