Jameco-electronics Rabbit 3000 Manual de usuario descargar pdf (Pagina 163)

154 Rabbit 3000 Microprocessor

The control register (TACR) is laid out as shown in Table 11-4.

The Timer A Prescale Register (TAPR) specifies the main clock for Timer A. This will

affect all of the timer A countdown timers. By default Timer A is clocked by peripheral

clock divided by two.

The prescale register (TAPR) is laid out as shown in Table 11-5.

Table 11-4. Timer A Control Register

Timer A Control Register (TACR) (Address = 0x00A4)

Bit(s) Value Description

0 Timer A7 clocked by the main Timer A clock.

1 Timer A7 clocked by the output of Timer A1.

0 Timer A6 clocked by the main Timer A clock.

1 Timer A6 clocked by the output of Timer A1.

0 Timer A5 clocked by the main Timer A clock.

1 Timer A5 clocked by the output of Timer A1.

0 Timer A4 clocked by the main Timer A clock.

1 Timer A4 clocked by the output of Timer A1.

0 Timer A3 clocked by the main Timer A clock.

1 Timer A3 clocked by the output of Timer A1.

0 Timer A2 clocked by the main Timer A clock.

1 Timer A2 clocked by the output of Timer A1.

1:0

00 Timer A interrupts are disabled.

01 Timer A interrupts use Interrupt Priority 1.

10 Timer A interrupts use Interrupt Priority 2.

11 Timer A interrupts use Interrupt Priority 3.

Table 11-5. Timer A Prescale Register

Timer A Prescale Register (TAPR) (Address = 0x00A1)

Bit(s) Value Description

7:1 These bits are ignored.

0 The main clock for Timer A is the peripheral clock.

1 The main clock for Timer A is the peripheral clock divided by two.

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 348 349

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Jameco-electronics Rabbit 3000 Manual de usuario Pagina 163