Using only timer 0 in 8-bit mode | Fujitsu MB89202, F202RA guide

CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.10Notes on Using 8/16-bit Capture Timer/Counter

This section provides notes on using the 8/16-bit capture timer/counter.

■Notes on Using the 8/16-bit Capture Timer/Counter

●Error

The start of the 8/16-bit capture timer/counter by a program is asynchronous with the start of the counter incremented by the selected count clock, and therefore, the error (a time difference) continues until the counter value matches the set data. Such a time difference may shorten the total count duration by a maximum of one count clock cycle. Figure 8.10-1shows the error (a time difference) that prolongs the actual start of count operation.

Figure 8.10-1 Error Occurring until the Count Operation is Started

Counter value

Count clock

1 cycle

Count 0

Error cycle

Counter start

●Using only timer 0 in 8-bit mode

When using only timer 0 of the 8/16-bit capture timer/counter in the 8-bit mode, set a value other than 111B in the count clock selection bits (TCS12, TCS11, TCS10) of the timer 1 control register (TCR1). Using timer 0 without setting 111B results in a malfunction.

●Note on setting by program

When using the 8/16-bit capture timer/counter in the 16-bit mode, set the count clock selection bits (TCS12, TCS11, TCS10) of TCR1 to 111B.

Before using the counter values when the counter is in operation with 16-bit mode, be sure to read the counter values twice and confirm that the values are valid.

Even if square wave output is initialized when the timer is in operation (TCR0: TSTR0 = 1), the output value is not modified. The output state is initialized when the timer operation stops.

When the interrupt request flag bits (TCCR: CPIF, TCR0: TIF0, TCR1: TIF1) are "1" and the interrupt

request enable bits are allowed (TCCR: CPIEN, TCR0: T0IEN, and TCR1: T1IEN = 1), return from an

interrupt is impossible. In this case, clear the interrupt request flag bits (TCCR: CFCLR = 1, TCR0: TFCR0 =

1, and TCR1: TFCR1 = 1).

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F202RA, MB89202 specifications

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Fujitsu MB89202, F202RA manual Error Occurring until the Count Operation is Started

Models: F202RA MB89202