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參數(shù)資料
| 型號(hào)： | MC68HC11F1FU1 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | ROM-based high-performance microcontrollers |
| 中文描述： | 基于ROM的高性能微控制器 |
| 文件頁數(shù)： | 99/124頁 |
| 文件大?。?/td> | 840K |
| 代理商： | MC68HC11F1FU1 |
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TIMING SYSTEM
TECHNICAL DATA
9-13
The clock source for the RTI function is a free-running clock that cannot be stopped or
interrupted except by reset. This clock causes the time between successive RTI time-
outs to be a constant that is independent of the software latencies associated with flag
clearing and service. For this reason, an RTI period starts from the previous time-out,
not from when RTIF is cleared.
Every time-out causes the RTIF bit in TFLG2 to be set, and if RTII is set, an interrupt
request is generated. After reset, one entire real-time interrupt period elapses before
the RTIF flag is set for the first time. Refer to the TMSK2, TFLG2, and PACTL regis-
ters.
9.4.1 Timer Interrupt Mask 2 Register
This register contains the real-time interrupt enable bits.
TOI — Timer Overflow Interrupt Enable
Refer to
9.3 Output Compare
.
RTII — Real-time Interrupt Enable
0 = RTIF interrupts disabled
1 = Interrupt requested when RTIF is set to one
PAOVI — Pulse Accumulator Overflow Interrupt Enable
Refer to
9.6 Pulse Accumulator
.
PAII — Pulse Accumulator Input Edge
Refer to
9.6 Pulse Accumulator
.
NOTE
Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Ones in
TMSK2 enable the corresponding interrupt sources.
9.4.1 Timer Interrupt Flag 2 Register
Bits of this register indicate the occurrence of timer system events. Coupled with the
four high-order bits of TMSK2, the bits of TFLG2 allow the timer subsystem to operate
in either a polled or interrupt driven system. Each bit of TFLG2 corresponds to a bit in
TMSK2 in the same position.
RTR[1:0]
0 0
0 1
1 0
1 1
E = 1 MHz
2.731 ms
5.461 ms
10.923 ms
21.845 ms
E = 2 MHz
4.096 ms
8.192 ms
16.384 ms
32.768 ms
E = 3 MHz
8.192 ms
16.384 ms
32.768 ms
65.536 ms
E = X MHz
(E/2
13
)
(E/2
14
)
(E/2
15
)
(E/2
16
)
TMSK2
— Timer Interrupt Mask 2
$0024
Bit 7
TOI
0
6
5
4
3
0
0
2
0
0
1
Bit 0
PR0
0
RTII
0
PAOVI
0
PAII
0
PR1
0
RESET:
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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