參數(shù)資料
型號(hào)： MC68HC705X4
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 107/156頁
文件大?。?/td> 940K
代理商： MC68HC705X4
Core Timer
Core timer registers
MC68HC05X4 Rev 1.0
Core Timer
5-ctimer
This bit is set when the output of the chosen stage becomes active;
an interrupt request will be generated if RTIE is set. When set, the bit
may be cleared by writing a ‘0’ to it.
CTOE — Core timer overflow interrupt enable
1 = A core timer overflow interrupt will be generated if CTOF is set
and the I-bit in the CCR is clear.
0 = No core timer overflow interrupt will be generated regardless of
the state of the CTOF flag and the I-bit.
RTIE — Real time interrupt enable
0 = A real time interrupt will be generated if RTIF is set and the I-bit
in the CCR is clear.
0 = No real time interrupt will be generated regardless of the state
of the RTIF flag and the I-bit.
RT1, RT0 — Real time interrupt rate select
These two bits select one of four taps from the real time interrupt
circuitry. Reset sets both RT0 and RT1 to one, selecting the lowest
periodic rate and therefore the maximum time in which to alter them if
necessary. The COP reset times are also determined by these two
bits. Care should be taken when altering RT0 and RT1 if a timeout is
imminent, or if the timeout period is 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 before changing the RTI taps.
See
Table 1
for some example RTI periods.
Table 1. Example RTI periods
Bus frequency
f
OP
= 500 kHz
Bus frequency
f
OP
= 1 MHz
Bus frequency
f
OP
= 2 MHz
RT1 RT0Dratio
RTI
period
Minimum
COP
period
218.8ms
437.5ms
875.0ms
1.75s
RTI
period
Minimum
COP
period
109.4ms
218.8ms
437.5ms
875.0ms
RTI
period
Minimum
COP
period
54.7ms
109.4ms
218.8ms
437.5ms
0
0
1
1
0
1
0
1
2
14
2
15
2
16
2
17
31.3ms
62.5ms
125ms
250ms
15.6ms
31.3ms
62.5ms
125.1ms
7.8ms
15.6ms
31.3ms
62.5ms
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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