參數(shù)資料
型號(hào)： 68HRC05J5A
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁(yè)數(shù)： 56/106頁(yè)
文件大小： 1069K
代理商： 68HRC05J5A
GENERAL RELEASE SPECIFICATION
July 16, 1999
MOTOROLA
8-4
MULTI-FUNCTION TIMER
MC68HC05J5A
REV 2.1
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.
TOFE - Timer Overflow Enable
The TOFE 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 TOF flag bit is
set.
0 =
When cleared, no TIMER interrupt caused by TOF bit set will be
generated. This bit is cleared by reset.
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.
TOFR - Timer Overflow Acknowledge
The TOFR is an acknowledge bit that resets the TOF flag bit. This bit is unaf-
fected by reset. Reading the TOFR will always return a logical zero.
1 =
Clears the TOF flag bit.
0 =
Does not clear the TOF flag bit.
RTIFR - Real Time Interrupt Acknowledge
The RTIFR is an acknowledge bit that resets the RTIF flag bit. This bit is unaf-
fected by reset. Reading the RTIFR will always return a logical zero.
1 =
Clears the RTIF flag bit.
0 =
Does not clear the RTIF flag bit.
RT1, RT0 - Real Time Interrupt Rate Select
The RT0 and RT1 control bits select one of four taps for the Real Time Interrupt
circuit.
Table 8-1
shows the available interrupt rates for two f
op
values. Both the
RT0 and RT1 control bits are set by reset, selecting the lowest periodic rate and
therefore the maximum time in which to alter these bits if necessary. Care
should be taken when altering RT0 and RT1 if the time-out period is imminent
or uncertain. If the selected tap is modified during a cycle in which the counter
is switching, an RTIF could be missed or an additional one could be generated.
To avoid problems, the COP should be cleared just prior to changing RTI taps.
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