参数资料
型号: MC68HC705E5DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 103/148页
文件大小: 620K
代理商: MC68HC705E5DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Timer
General Release Specification
MC68HC705E5 Rev. 1.0
58
Timer
MOTOROLA
RTIE — Real-Time Interrupt Enable
When this bit is set, a CPU interrupt request is generated when the
RTIF bit is set. Reset clears this bit.
TOFA — Timer Over Flow Flag Acknowledge
When a one is written to this bit location, the TOF flag bit is cleared.
This bit always reads as a zero.
RTIFA — Real-Time Interrupt Flag Acknowledge
When a one is written to this bit location, the RTIF flag bit is cleared.
This bit always reads as a zero.
RT1–RT0 — Real-Time Interrupt Rate Select
These two bits select one of four taps from the real-time interrupt
circuit.Table 8-1 shows the available interrupt rates with several fop
values. Reset sets RT0 and RT1, 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.
Table 8-1. RTI Rates
RT1–RT0
RT1 Rates at fop Frequency Specified
16.384 kHz
524 kHz
1.049 MHz
2.097 MHz
4.194 MHz
fop
00
1 s
31.3 ms
15.6 ms
7.8 ms
3.9 ms
214
÷ f
op
01
2 s
62.5 ms
31.3 ms
15.6 ms
7.8 ms
215
÷ f
op
10
4 s
125 ms
62.5 ms
31.3 ms
15.6 ms
216
÷ f
op
11
8 s
250 ms
125.1 ms
62.5 ms
31.3 ms
217
÷ f
op
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