參數(shù)資料
型號(hào)： MC68HC11EA9MFN2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁(yè)數(shù)： 10/58頁(yè)
文件大?。?/td> 583K
代理商： MC68HC11EA9MFN2
MOTOROLA
MC68HC11EA9
18
MC68HC11EA9TS/D
ERASE — Erase/Normal Control for EEPROM
Refer to 4.10 EEPROM.
EELAT — EEPROM Latch Control
0 = EEPROM address and data bus configured for normal reads
1 = EEPROM address and data bus configured for programming or erasing
PGM — EPROM/OTPROM/EEPROM Programming Voltage Enable
0 = Programming voltage to EPROM/OTPROM/EEPROM array disconnected
1 = Programming voltage to EPROM/OTPROM/EEPROM array connected
PGM can be read any time and can only be written when ELAT = 1 (for EPROM/OTPROM program-
ming) or when EELAT = 1 (for EEPROM programming).
4.10 EEPROM
MC68HC(7)11EA9 MCUs contain 512 bytes of EEPROM. The 512-byte EEPROM is initially located at
$B600 after reset, assuming EEPROM is enabled in the memory map by the EEON bit in the CONFIG
register. EEPROM can be placed at any 4 Kbyte boundary ($x600) by writing appropriate values to the
INIT register. Note that EEPROM can be mapped such that it contains the vector space. See Figure 6.
4.10.1 Programming and Erasing EEPROM
Programming and erasing the EEPROM is controlled by the PPROG register, and is dependent upon
the block protect (BPROT) register value. The erased state of an EEPROM bit is one. During a read
operation, bit lines are precharged to one. The floating gate devices of programmed bits conduct and
pull the bit lines to zero. Unprogrammed bits remain at the precharged level and are read as ones. Pro-
gramming a bit to one causes no change. Programming a bit to zero changes the bit so that subsequent
reads return zero.
When appropriate bits in the BPROT register are cleared, the PPROG register controls programming
and erasing of the EEPROM. The PPROG register can be read or written at any time, but logic enforces
defined programming and erasing sequences to prevent unintentional changes to data in EEPROM.
When the EELAT bit in the PPROG register is cleared, the EEPROM can be read as if it were a ROM.
The on-chip charge pump that generates the EEPROM programming voltage from VDD uses MOS ca-
pacitors, which are relatively small in value. The efficiency of this charge pump and its drive capability
are affected by the level of VDD and the frequency of the driving clock. The clock source driving the
charge pump is software selectable. When the clock select (CSEL) bit in the OPTION register is zero,
the E clock is used; when CSEL is one, an on-chip resistor-capacitor (RC) oscillator is used. The RC
oscillator should be used when E < 1 MHz. This RC oscillator will drive the A/D circuitry as well as the
EEPROM charge pump when CSEL = 1.
The EEPROM programming voltage connection to the EEPROM array is not enabled until there has
been a write to PPROG with EELAT set and PGM cleared. This must be followed by a write to a valid
EEPROM location or to the CONFIG address, and then a write to PPROG with both EELAT and PGM
set. Any attempt to set both EELAT and PGM during the same write operation results in neither bit being
set.
The erased state of an EEPROM byte is $FF (all ones).
To erase the EEPROM, ensure that the proper bits of the BPROT register are cleared, then complete
the following steps using the PPROG register:
1.
Set the ERASE, EELAT, and appropriate BYTE and ROW bits in PPROG register.
2.
Write to the appropriate EEPROM address with any data. Row erase only requires a write to
any location in the row. Bulk erase is done by writing to any location in the array.
3.
Set the ERASE, EELAT, EEPGM, and appropriate BYTE and ROW bits in PPROG register.
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
MC68HC711EA9VP3 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP56
MC68HC711EA9MFS3 8-BIT, UVPROM, 3 MHz, MICROCONTROLLER, CQCC52
MC68HC711EA9MP3 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP56
MC68HC711EA9VFN3 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PQCC52
MC68HC11EA9MFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11EA9MFN3 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11EA9MP2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11EA9MP3 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11EA9VFN2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11EA9VFN3 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
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

*
*
*