M68HC05 datasheet(73/128 Pages) FREESCALE

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Multifunction Timer

Timer Status and Control Register

MC68HC05J1A — Rev. 3.0

Technical Data

Multifunction Timer

8.3 Timer Status and Control Register

The read/write timer status and control register (TSCR) contains these

bits:

•

Timer interrupt enable bits

•

Timer interrupt flags

•

Timer interrupt flag reset bits

•

Timer interrupt rate select bits

TOF — Timer Overflow Flag

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.

RTIF — Real-Time Interrupt Flag

This read-only flag becomes set when the selected real-time interrupt

(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.

TOIE — Timer Overflow Interrupt Enable Bit

This read/write bit enables timer overflow interrupts.

1 = Timer overflow interrupts enabled

0 = Timer overflow interrupts disabled

Address:

$0008

Bit 7

54321

Bit 0

Read:

TOF

RTIF

TOIE

RTIE

RT1

RT0

Write:

TOFR

RTIFR

Reset:

000011

= Unimplemented

Figure 8-2. Timer Status and Control Register (TSCR)

Freescale Semiconductor, Inc.

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