Reload/Compare Function - Fujitsu F2MC-16LX Hardware Manual

Mb90470 series 16-bit microcontroller

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13.3.1 Reload/compare function

The 8/16-bit up/down counter/timer has reload and compare functions. These two

functions may be mixed for processing.

I Reload and compare functions

Table 13.3-3 "Selection of count mode" shows an example of selecting reload and compare

Table 13.3-3 Selection of count mode

I Reload function

At the start of the reload function, the RCR value is transferred to UDCR at the timing of the

down-count clock next to the clock in which an underflow occurs. In this example, UDFF is

specified, and an interrupt request occurs.

In a mode where there is no down counting (decrement), the start of this function is disabled.

Reload and compare functions

Reload/compare prohibit (initial value)

Compare permit

Reload permit

Reload/compare permit

Figure 13.3-3 Outline of reload function operation

Reload/interrupt generated

CHAPTER 13 8/16-BIT UP/DOWN COUNTER/TIMER

Reload/interrupt generated