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參數(shù)資料
| 型號(hào)： | MC68HC05F4FB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 61/130頁(yè) |
| 文件大?。?/td> | 10504K |
| 代理商： | MC68HC05F4FB |
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3-6
MC68HC05F4
MEMORY AND REGISTERS
3
EEPGM — EEPROM programming power enable
1 (set)
–
Programming power connected to the EEPROM array.
0 (clear) –
Programming power switched off.
EEPGM must be set to enable the EEPGM function. When set, EEPGM turns on the charge pump
and enables the programming (or erasing) power to the EEPROM array. When clear, this power is
switched off. This will enable pulsing of the programming voltage to be controlled internally. This
bit can be read at any time, but can only be written to if LATCH = 1, i.e. if LATCH is not set, then
EEPGM cannot be set. Reset clears this bit.
3.5.2
Programming and erasing procedures
To program a byte of EEPROM, set LATCH = CPEN = 1, set ER1 = ER0 = 0, write data to the
desired address and then set EEPGM for a time tEPGM.
There are three possibilities for erasing data from the EEPROM array, depending on how much
data is affected.
To erase a byte of EEPROM, set LATCH = CPEN = 1, set ER1 = 0 and ER0 = 1, write data to
the desired address and then set EEPGM for a time tEBYTE.
To erase a block of EEPROM, set LATCH = CPEN = 1, set ER1 = 1 and ER0 = 0, write data
to any address in the block and then set EEPGM for a time tEBLOCK.
To bulk erase the EEPROM, set LATCH = CPEN = 1, set ER1 = ER0 = 1, write data to any
address in the array and then set EEPGM for a time tEBULK.
To terminate the programming or erase sequence, clear EEPGM, wait for a time tFPV to allow the
programming voltage to fall, and then clear LATCH and CPEN to release the buses. Following
each erase or programming sequence, clear all programming control bits.
3.5.3
Sample EEPROM programming sequence
The following program is an example of the EEPROM programming sequence, using the timer to
implement the required delay and assuming a 1 MHz bus frequency.
TPG
32
05F4Book Page 6 Tuesday, August 5, 1997 1:10 pm
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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