HCS08 datasheet(76/290 Pages) MOTOROLA

76 / 290 page

Resets, Interrupts, and System Configuration

MC9S08GB/GT

MOTOROLA

RTIF — Real-Time Interrupt Flag

This read-only status bit indicates the periodic wakeup timer has timed out.

1 = Periodic wakeup timer timed out.

0 = Periodic wakeup timer not timed out.

RTIACK — Real-Time Interrupt Acknowledge

This write-only bit is used to acknowledge real-time interrupt request (write 1 to clear RTIF). Writing

0 has no meaning or effect. Reads always return logic 0.

RTICLKS — Real-Time Interrupt Clock Select

This read/write bit selects the clock source for the real-time interrupt.

1 = Real-time interrupt request clock source is external clock.

0 = Real-time interrupt request clock source is internal 1-kHz oscillator.

RTIE — Real-Time Interrupt Enable

This read-write bit enables real-time interrupts.

1 = Real-time interrupts enabled.

0 = Real-time interrupts disabled.

RTIS2:RTIS1:RTIS0 — Real-Time Interrupt Delay Selects

These read/write bits select the wakeup delay for the RTI. The clock source for the real-time interrupt

is a self-clocked source which oscillates at about 1 kHz, is independent of other MCU clock sources.

Using external clock source the delays will be crystal frequency divided by value in

RTIS2:RTIS1:RTIS0.

Table 5-2 Real-Time Interrupt Frequency

RTIS2:RTIS1:RTIS0

1-kHz Clock Source Delay(1)

NOTES:

1. Normal values are shown in this column based on fRTI = 1 kHz. See Table A-10 Control Timing fRTI for the

tolerance on these values.

Using External Clock Source Delay

(crystal frequency)

0:0:0

Disable periodic wakeup timer

0:0:1

8 ms

divide by 256

0:1:0

32 ms

divide by 1024

0:1:1

64 ms

divide by 2048

1:0:0

128 ms

divide by 4096

1:0:1

256 ms

divide by 8192

1:1:0

512 ms

divide by 16384

1:1:1

1.024 s

divide by 32768

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