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參數資料
型號: MC68HC11A1CFN2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQCC52
封裝: PLASTIC, LCC-52
文件頁數: 32/158頁
文件大小: 776K
代理商: MC68HC11A1CFN2
MOTOROLA
3-6
ON-CHIP MEMORY
MC68HC11A8
TECHNICAL DATA
3
The erased state of an EEPROM byte is $FF. Programming changes ones to zeros. If
any bit in a location needs to be changed from a zero to a one, the byte must be erased
in a separate operation before it is reprogrammed. If a new data byte has no ones in
bit positions which were already programmed to zero, it is acceptable to program the
new data without erasing the EEPROM byte first. For example, programming $50 to a
location which was already $55 would change the location to $50.
Programming and erasure of the EEPROM relies on an internal high-voltage charge
pump. At E clock frequencies below 2 MHz the efficiency of this charge pump decreas-
es which increases the time required to program or erase a location. The recommend-
ed program and erase time is 10 milliseconds when the E clock is 2 MHz and should
be increased to as much as 20 milliseconds when E is between 1 MHz and 2 MHz.
When the E clock is below 1 MHz, the clock source for the charge pump should be
switched from the system clock to an on-chip R-C oscillator clock. This is done by set-
ting the CSEL bit in the OPTION register. A 10 millisecond period should be allowed
after setting the CSEL bit to allow the charge pump to stabilize. Note that the CSEL bit
also controls a clock to the analog-to-digital converter subsystem.
3.5.1 EEPROM Programming Control Register (PPROG)
This 8-bit register is used to control programming and erasure of the 512-byte EE-
PROM. Reset clears this register so the EEPROM is configured for normal reads.
ODD — Program Odd Rows (TEST)
EVEN — Program Even Rows (TEST)
Bit 5 — Not implemented.
This bit always reads zero.
BYTE — Byte Erase Select
This bit overrides the ROW bit.
0 = Row or Bulk Erase
1 = Erase Only One Byte
ROW — Row Erase Select
If the BYTE bit is 1, ROW has no meaning.
0 = Bulk Erase
1 = Row Erase
ERASE — Erase Mode Select
0 = Normal Read or Program
1 = Erase Mode
7
6
5
0
0
4
3
2
1
0
$
1
03B
RESET
ODD
0
EVEN
0
BYTE
0
ROW
0
ERASE
0
EELAT
0
EEPGM
0
PPROG
相關PDF資料
PDF描述
MC68HCP11A1CFN2 HCMOS Single-Chip Microcontroller
MC68HCP11A1CFN3 HCMOS Single-Chip Microcontroller
MC68HCP11A1CP2 HCMOS Single-Chip Microcontroller
MC68HCP11A1CP3 HCMOS Single-Chip Microcontroller
MC68HCP11A1MFN2 HCMOS Single-Chip Microcontroller
相關代理商/技術參數
參數描述
MC68HC11A1CFN3 制造商:Rochester Electronics LLC 功能描述:
MC68HC11A1CFNE3 功能描述:8位微控制器 -MCU 8B MCU 256RAM A/D EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
MC68HC11A1CFNE3 制造商:Freescale Semiconductor 功能描述:8-BIT MICROCONTROLLER IC
MC68HC11A1CFNE3R 功能描述:8位微控制器 -MCU 8B MCU 256RAM A/D EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
MC68HC11A1CFU2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
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