參數(shù)資料
型號(hào)： MC68HC11EA9VFN3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁(yè)數(shù)： 25/58頁(yè)
文件大小： 583K
代理商： MC68HC11EA9VFN3
MC68HC11EA9
MOTOROLA
MC68HC11EA9TS/D
31
7 Timing System
The timing system is based on a free-running 16-bit counter with a four-stage programmable prescaler.
A timer overflow function allows software to extend the system’s timing capability beyond the counter's
16-bit range. The main timer consists of the timer prescaler, the 16-bit free-running counter, and the
capture/compare unit. 7.2 Main Timer details this portion of the timing system.
The free-running counter can be driven by either the EXTAL signal, as in other M68HC11 derivatives
or it can be driven by a software-controlled phase-locked loop (PLL) frequency synthesizer which has
been added to the MC68HC(7)11EA9 MCUs. The PLL allows the MCU to operate in WAIT mode with
extremely low power requirements. Refer to 7.1 Phase-Locked Loop Synthesizer.
In addition, the timing system includes pulse accumulator and real-time interrupt (RTI) functions, as well
as a clock monitor function, which can be used to detect clock failures that are not detected by the COP
system. Refer to the appropriate paragraphs within this section for information regarding these func-
tions. Table 12 shows a summary of the crystal-related frequencies and periods.
Table 12 Timer Summary
Control Bits
Common System Frequencies
Definition
4.0 MHz
8.0 MHz
12.0 MHz
XTAL
1.0 MHz
2.0 MHz
3.0 MHz
E
PR[1:0]
Main Timer Count Rate (Period Length)
0 0
1 count —
1000 ns
500 ns
333 ns
1/E
overflow —
65.536 ms
32.768 ms
21.845 ms
216/E
0 1
1 count —
4.0
s
2.0
s
1.333
s
4/E
overflow —
262.14 ms
131.07 ms
32.768 ms
218/E
1 0
1 count —
8.0
s
4.0
s
2.667
s
8/E
overflow —
524.28 ms
262.14 ms
174.76 ms
219/E
1 1
1 count —
16.0
s
8.0
s
5.333
s
16/E
overflow —
1.049 s
524.29 ms
349.52 ms
220/E
RTR[1:0]
Periodic (RTI) Interrupt Rates (Period Length)
0 0
8.192 ms
4.096 ms
2.731 ms
213/E
0 1
16.384 ms
8.192 ms
5.461 ms
214/E
1 0
32.768 ms
16.384 ms
10.923 ms
215/E
1 1
65.536 ms
32.768 ms
21.845 ms
216/E
CR[1:0]
COP Watchdog Timeout Rates (Period Length)
0 0
32.768 ms
16.384 ms
10.923 ms
215/E
0 1
131.072 ms
65.536 ms
43.691 ms
217/E
1 0
524.288 ms
262.14 ms
174.76 ms
219/E
1 1
2.098 s
1.049 s
699.05 ms
221/E
Time-out Tolerance
(–0 ms/+...)
32.8 ms
16.4 ms
10.9 ms
215/E
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關(guān)PDF資料
PDF描述
MC68HC711EA9MP2 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP56
MC68HC711EA9MFS2 8-BIT, UVPROM, 2 MHz, MICROCONTROLLER, CQCC52
MC68HC11EA9VFN2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
MC68HC11EA9CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52
MC68HC11EA9MFN2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11EA9VP2 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11EA9VP3 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11ED0 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Summary
MC68HC11ED0CFN2 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Summary
MC68HC11ED0CFN3 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Summary
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*