mc9s08rd60fj Freescale Semiconductor, Inc, mc9s08rd60fj Datasheet - Page 70

• Manufacturer Part Number: mc9s08rd60fj
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Resets, Interrupts, and System Configuration
RTIF — Real-Time Interrupt Flag
RTIACK — Real-Time Interrupt Acknowledge
RTICLKS — Real-Time Interrupt Clock Select
RTIE — Real-Time Interrupt Enable
RTIS2:RTIS1:RTIS0 — Real-Time Interrupt Delay Selects
70
NOTES:
RTIS2:RTIS1:RTIS0
This read-only status bit indicates the periodic wakeup timer has timed out.
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.
This read/write bit selects the clock source for the real-time interrupt.
This read-write bit enables real-time interrupts.
These read/write bits select the wakeup delay for the RTI. The clock source for the real-time interrupt
is a self-clocked source that oscillates at about 1 kHz and is independent of other MCU clock sources.
Using an external clock source, the delays will be crystal frequency divided by the value in
RTIS2:RTIS1:RTIS0.
1. Normal values are shown in this column based on f
1 = Periodic wakeup timer timed out.
0 = Periodic wakeup timer not timed out.
1 = Real-time interrupt request clock source is external clock.
0 = Real-time interrupt request clock source is internal 1-kHz oscillator.
1 = Real-time interrupts enabled.
0 = Real-time interrupts disabled.
on these values.
0:0:0
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
Table 5-2 Real-Time Interrupt Frequency
1-kHz Clock Source Delay
Disable periodic wakeup timer
128 ms
256 ms
512 ms
1.024 s
32 ms
64 ms
8 ms
MC9S08RC/RD/RE/RG
RTI
= 1 kHz. See
(1)
Table C-9 Control Timing
Using External Clock Source Delay
Disable periodic wakeup timer
(crystal frequency)
divide by 16384
divide by 32768
divide by 2048
divide by 4096
divide by 8192
divide by 1024
divide by 256
Freescale Semiconductor
f
RTI
for the tolerance