MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 113

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC705J1A — Rev. 4.0
MOTOROLA
NOTE:
TOF — Timer Overflow Flag
RTIF — Real-Time Interrupt Flag
TOIE — Timer Overflow Interrupt Enable Bit
RTIE — Real-Time Interrupt Enable Bit
TOFR — Timer Overflow Flag Reset Bit
RTIFR — Real-Time Interrupt Flag Reset Bit
RT1 and RT0 — Real-Time Interrupt Select Bits
Changing RT1 and RT0 when a COP timeout is imminent can cause a
real-time interrupt request to be missed or an additional real-time
This read-only flag becomes set when the first eight stages of the
counter roll over from $FF to $00. TOF generates a timer overflow
interrupt request if TOIE is also set. Clear TOF by writing a logic 1 to
the TOFR bit. Writing to TOF has no effect. Reset clears TOF.
This read-only flag becomes set when the selected RTI output
becomes active. RTIF generates a real-time interrupt request if RTIE
is also set. Clear RTIF by writing a logic 1 to the RTIFR bit. Writing
to RTIF has no effect. Reset clears RTIF.
This read/write bit enables timer overflow interrupts. Reset clears
TOIE.
This read/write bit enables real-time interrupts. Reset clears RTIE.
Writing a logic 1 to this write-only bit clears the TOF bit. TOFR always
reads as logic 0. Reset clears TOFR.
Writing a logic 1 to this write-only bit clears the RTIF bit. RTIFR
always reads as logic 0. Reset clears RTIFR.
These read/write bits select one of four real-time interrupt rates, as
shown in
watchdog, changing the real-time interrupt rate also changes the
counting rate of the COP watchdog. Reset sets RT1 and RT0.
1 = Timer overflow interrupts enabled
0 = Timer overflow interrupts disabled
1 = Real-time interrupts enabled
0 = Real-time interrupts disabled
Table
Multifunction Timer Module
9-1. Because the selected RTI output drives the COP
Multifunction Timer Module
Technical Data
I/O Registers
113