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| 型號(hào)： | MC68HC11E9BCB3 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers |
| 中文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | SDIP-56 |
| 文件頁(yè)數(shù)： | 57/268頁(yè) |
| 文件大?。?/td> | 3696K |
| 代理商： | MC68HC11E9BCB3 |
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Operating Modes and On-Chip Memory
EEPROM
M68HC11E Family — Rev. 5
Data Sheet
MOTOROLA
Operating Modes and On-Chip Memory
For More Information On This Product,
Go to: www.freescale.com
57
2.5 EEPROM
Some E-series devices contain 512 bytes of on-chip EEPROM. The
MC68HC811E2 contains 2048 bytes of EEPROM with selectable base address. All
E-series devices contain the EEPROM-based CONFIG register.
2.5.1 EEPROM and CONFIG Programming and Erasure
The erased state of an EEPROM bit is 1. During a read operation, bit lines are
precharged to 1. The floating gate devices of programmed bits conduct and pull the
bit lines to 0. Unprogrammed bits remain at the precharged level and are read as
ones. Programming a bit to 1 causes no change. Programming a bit to 0 changes
the bit so that subsequent reads return 0.
When appropriate bits in the BPROT register are cleared, the PPROG register
controls programming and erasing 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 EEPROM data. 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
V
DD
uses MOS capacitors, which are relatively small in value. The efficiency of this
charge pump and its drive capability are affected by the level of V
DD
and the
frequency of the driving clock. The load depends on the number of bits being
programmed or erased and capacitances in the EEPROM array.
The clock source driving the charge pump is software selectable. When the clock
select (CSEL) bit in the OPTION register is 0, the E clock is used; when CSEL is 1,
an on-chip resistor-capacitor (RC) oscillator is used.
The EEPROM programming voltage power supply voltage 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 the EELAT and EPGM bits
set. Any attempt to set both EELAT and EPGM during the same write operation
results in neither bit being set.
2.5.1.1 Block Protect Register
This register prevents inadvertent writes to both the CONFIG register and
EEPROM. The active bits in this register are initialized to 1 out of reset and can be
cleared only during the first 64 E-clock cycles after reset in the normal modes.
When these bits are cleared, the associated EEPROM section and the CONFIG
register can be programmed or erased. EEPROM is only visible if the EEON bit in
the CONFIG register is set. The bits in the BPROT register can be written to 1 at
any time to protect EEPROM and the CONFIG register. In test or bootstrap modes,
write protection is inhibited and BPROT can be written repeatedly. Address ranges
for protected areas of EEPROM differ significantly for the MC68HC811E2. Refer to
Figure 2-16
.
F
Freescale Semiconductor, Inc.
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MC68HC11E9BCFN2 | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC11E9BCFN3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11E9BCFNE2 | 功能描述:8位微控制器 -MCU 8B MCU 12K BUFFALO ROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC68HC11E9BCFNE2 | 制造商:Freescale Semiconductor 功能描述:8-BIT MICROCONTROLLER IC |
| MC68HC11E9BCFU2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter |
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