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參數(shù)資料
| 型號(hào)： | MC68HLC705KJ1CP |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 37/117頁(yè) |
| 文件大?。?/td> | 1644K |
| 代理商： | MC68HLC705KJ1CP |
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Memory
Data Sheet
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
26
Memory
MOTOROLA
2.7.2 EPROM Programming Register
The EPROM programming register (EPROG) contains the control bits for
programming the EPROM/OTPROM.
ELAT — EPROM Bus Latch Bit
This read/write bit latches the address and data buses for EPROM/OTPROM
programming. Clearing the ELAT bit automatically clears the EPGM bit.
EPROM/OTPROM data cannot be read while the ELAT bit is set. Reset clears
the ELAT bit.
1 = Address and data buses configured for EPROM/OTPROM programming
the EPROM
0 = Address and data buses configured for normal operation
MPGM — MOR Programming Bit
This read/write bit applies programming power from the IRQ/VPP pin to the
mask option register. Reset clears MPGM.
1 = Programming voltage applied to MOR
0 = Programming voltage not applied to MOR
EPGM — EPROM Programming Bit
This read/write bit applies the voltage from the IRQ/VPP pin to the EPROM. To
write the EPGM bit, the ELAT bit must be set already. Reset clears EPGM.
1 = Programming voltage (IRQ/VPP pin) applied to EPROM
0 = Programming voltage (IRQ/VPP pin) not applied to EPROM
NOTE:
Writing logic 1s to both the ELAT and EPGM bits with a single instruction sets ELAT
and clears EPGM. ELAT must be set first by a separate instruction.
Bits [7:3] — Reserved
Take the following steps to program a byte of EPROM/OTPROM:
1.
Apply the programming voltage, VPP, to the IRQ/VPP pin.
2.
Set the ELAT bit.
3.
Write to any EPROM/OTPROM address.
4.
Set the EPGM bit and wait for a time, tEPGM.
5.
Clear the ELAT bit.
Address:
$0018
Bit 7
654321
Bit 0
Read:
00000
ELAT
MPGM
EPGM
Write:
RRRR
Reset:
00000000
= Unimplemented
R
= Reserved
Figure 2-3. EPROM Programming Register (EPROG)
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