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参数资料
| 型号： | MC68HC08AS20CFN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 63/96页 |
| 文件大小： | 3243K |
| 代理商： | MC68HC08AS20CFN |
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7
MOTOROLA
7-6
MC68HC05E0
TIMERS
The RTI system is controlled via the RTI Control Register ($0018).
RTIF is a clearable, read-only status bit and is set when the output of the chosen selector stage
(1 of 4) goes active. A CPU interrupt request will be generated (IRQB) if the Real Time Interrupt
is enabled. Clearing the RTIF bit is done by writing a “zero” to it. Writing a “one” to RTIF has no
effect. Reset clears RTIF.
RTIF
1 (set)
–
RTI function has timed out and generated interrupt signal.
0 (clear) –
RTI function has not timed out.
RTIE is a read/write control bit which allows the Real Time Interrupt to generate a CPU interrupt
request (IRQ). Reset clears RTIE.
RTIE
1 (set)
–
RTI request enabled
0 (clear) –
RTI request disabled
RT1, RT0 select one of four taps from the Real Time Interrupt Select logic. On reset, these bits
are set to “one” which selects the lowest periodic interrupt rate, and gives the maximum time in
which to modify the bits to select a different time-out period. Care should be taken when altering
RT1 and RT0 if a timeout is imminent or uncertain; if a tap is selected during a cycle in which the
counter is switching, an interrupt request could be missed, or an additional one generated.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
RTI control register
$0018
RTIF
RTIE
RT1
RT0
0000 0011
Table 7-2 Real Time Interrupt Rates (bus frequency = 4MHz)
RT1
RT0
RTI time-out period (ms)
0
4.1
0
1
8.2
1
0
16.4
1
32.8
66
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