68HC05JB3 datasheet(56/134 Pages) FREESCALE

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GENERAL RELEASE SPECIFICATION

November 5, 1998

MOTOROLA

MULTI-FUNCTION TIMER

MC68HC05JB3

8-4

REV 1

RTIE — Real Time Interrupt Enable

The RTIE is an enable bit that allows generation of a TIMER Interrupt by the

RTIF bit.

1 =

When set, the TIMER Interrupt is generated when the RTIF ﬂag bit is

set.

0 =

When cleared, no TIMER interrupt caused by RTIF bit set will be

generated. This bit is cleared by reset.

CTOFE — Timer Overﬂow Enable

The CTOFE is an enable bit that allows generation of a TIMER Interrupt upon

overﬂow of the Timer Counter Register.

1 =

When set, the TIMER Interrupt is generated when the CTOF flag bit

is set.

0 =

When cleared, no TIMER interrupt caused by CTOF bit set will be

generated. This bit is cleared by reset.

RTIF — Real Time Interrupt Flag

The RTIF is a read-only ﬂag bit.

1 =

Set when the output of the chosen (1 of 4 selections) Real Time

Interrupt stage goes active. A TIMER Interrupt request will be

generated if RTIE is also set.

0 =

Reset by writing a logical one to the RTIF acknowledge bit, RTIFR.

Writing to the RTIF ﬂag bit has no effect on its value. This bit is

cleared by reset.

CTOF — Timer Overﬂow Flag

The CTOF is a read-only ﬂag bit.

1 =

Set when the 8-bit ripple counter rolls over from $FF to $00. A

TIMER Interrupt request will be generated if CTOFE is also set.

0 =

Reset by writing a logical one to the CTOF acknowledge bit,

CTOFR. Writing to the CTOF flag bit has no effect on its value. This

bit is cleared by reset.

8.4

OPERATION DURING STOP MODE

When STOP is exited by an external interrupt or an LVR reset or an external

RESET, the internal oscillator will resume, followed by a 224 or 4064 internal pro-

cessor oscillator stabilization delay.

8.5

COP CONSIDERATION DURING STOP MODE

In STOP mode, the clock to the Watchdog Timer is stopped and is therefore

impossible to generate COP reset when in STOP mode. The COP function will

resume 224 or 4064 cycles after exiting from STOP.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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