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參數(shù)資料
| 型號： | MC68HC05F4FB |
| 廠商： | MOTOROLA 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： | QFP-44 |
| 文件頁數(shù)： | 59/130頁 |
| 文件大?。?/td> | 2089K |
| 代理商： | MC68HC05F4FB |
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MOTOROLA
3-4
MC68HC05F4
MEMORY AND REGISTERS
3
3.4
Bootloader ROM
The MC68HC05F4 has 240 bytes of bootloader ROM, from $3F00 to $3FEF.
3.5
EEPROM
256 bytes of user EEPROM reside at addresses $0200 to $02FF.
Programming or erasing the EEPROM can be done by the user on a single byte basis; erasing
may also be performed on a block or bulk basis. All programming or erasing is accomplished by
manipulating the programming register (EEPROG), located at address $001C.
Note:
The erased state of an EEPROM byte is ‘$FF’. This means that a write forces zeros to
the bits specied, whilst bits dened as ones are unchanged by a write operation.
Caution:
There is a restriction on the use of indexed addressing for EEPROM read operations.
When the base address of an indexed read of an EEPROM location is within the
EEPROM address range ($0400 to $04FF), the read may not be successful.
e.g. LDA (BASE ADDRESS), X – may not give the correct result when the base
address is in the range $0400 to $04FF. However, if the base address is outwith the
EEPROM address range, the read operation will be successful. This restriction applies
to all operations capable of using indexed addressing.
3.5.1
EEPROM programming register
CPEN — Charge pump enable
1 (set)
–
Charge pump enabled.
0 (clear) –
Charge pump disabled.
When set, CPEN enables the charge pump which produces the internal programming voltage.
This bit should be set at the same time as the LATCH bit. The programming voltage will not be
available until EEPGM is set. The charge pump should be disabled when not in use. CPEN is
readable and writable and is cleared by reset.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
EEPROM programming (EEPROG)
$001C
0
CPEN
0
ER1
ER0
LATCH EERC EEPGM 0000 0000
TPG
30
05F4Book Page 4 Tuesday, August 5, 1997 1:10 pm
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05F5 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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| MC68HC05J1 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
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