參數(shù)資料
型號： MC68HC11F1CPU4
廠商： Freescale Semiconductor
文件頁數(shù)： 33/158頁
文件大?。?/td> 0K
描述： IC MCU 512 EEPROM 4MHZ 80-LQFP
標(biāo)準(zhǔn)包裝： 90
系列： HC11
核心處理器： HC11
芯體尺寸： 8-位
速度： 4MHz
連通性： SCI，SPI
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 30
程序存儲器類型： ROMless
EEPROM 大小： 512 x 8
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 80-LQFP
包裝： 托盤
ANALOG-TO-DIGITAL CONVERTER
MC68HC11F1
10-4
TECHNICAL DATA
indicates when valid data is present in the result registers. The result registers are writ-
ten during a portion of the system clock cycle when reads do not occur, so there is no
conflict.
10.1.5 A/D Converter Clocks
The CSEL bit in the OPTION register selects whether the A/D converter uses the sys-
tem E clock or an internal RC oscillator for synchronization. When the A/D system is
operating with the MCU E clock, all switching and comparator functions are synchro-
nized to the MCU clocks. This allows the comparator results to be sampled at relatively
quiet clock times to minimize noise errors.
When E-clock frequency is below 750 kHz, charge leakage in the capacitor array can
cause errors, and the internal oscillator should be used. The RC clock is asynchronous
to the MCU internal E clock. Therefore, when the RC clock is used, additional errors
can occur because the comparator is sensitive to the additional system clock noise.
10.1.6 Conversion Sequence
A/D converter operations are performed in sequences of four conversions each. A
conversion sequence can repeat continuously or stop after one iteration. The conver-
sion complete flag (CCF) is set after the fourth conversion in a sequence to show the
availability of data in the result registers. Figure 10-3 shows the timing of a typical se-
quence. Synchronization is referenced to the system E clock.
Figure 10-3 A/D Conversion Sequence
MSB
4
CYCLES
E CLOCK
WRITE
BIT 6
2
CYC
BIT 5
2
CYC
BIT 4
2
CYC
BIT 3
2
CYC
BIT 2
2
CYC
BIT 1
2
CYC
LSB
2
CYC
END
12 E CYCLES
SAMPLE ANALOG INPUT
SUCCESSIVE APPROXIMATION SEQUENCE
2
CYC
CONVERT FOURTH
CHANNEL
AND UPDATE ADDR4
CONVERT THIRD
CHANNEL
AND UPDATE ADDR3
CONVERT SECOND
CHANNEL
AND UPDATE ADDR2
CONVERT FIRST
CHANNEL
AND UPDATE ADDR1
SET
REPEAT
E
CYCLES
128
96
64
32
0
TO
ADCTL
SEQUENCE
IF
SCAN = 1
CCF
FLAG
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
MC68HRC908JK3CDW IC MCU 4K FLASH 8MHZ SO20
MC68HC711K4CFU4 IC MCU 24K 4MHZ EEPROM 80-QFP
MC68HC11K1CFN4 IC MCU 640 EEPROM 4MHZ 84-PLCC
MC68332ACFC20B1 IC MCU 32BIT 20MHZ 132-PQFP
MC68332GCFC16 IC MCU 32BIT 16MHZ 132-PQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11F1CPU5 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Technical Summary 8-Bit Microcontroller
MC68HC11F1CPUE5 制造商:Freescale Semiconductor 功能描述:
MC68HC11F1FB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11F1FB1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11F1FB3 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

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

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

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*