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參數(shù)資料
| 型號： | MC68HLC705KJ1 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Computer Operation Properly Module |
| 中文描述： | 電腦操作正確模塊 |
| 文件頁數(shù)： | 26/108頁 |
| 文件大?。?/td> | 718K |
| 代理商： | MC68HLC705KJ1 |
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Memory
MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
26
Freescale Semiconductor
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/V
PP
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/V
PP
pin to the EPROM. To write the EPGM bit, the
ELAT bit must be set already. Reset clears EPGM.
1 = Programming voltage (IRQ/V
PP
pin) applied to EPROM
0 = Programming voltage (IRQ/V
PP
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, V
PP
, to the IRQ/V
PP
pin.
2.
Set the ELAT bit.
3.
Write to any EPROM/OTPROM address.
4.
Set the EPGM bit and wait for a time, t
EPGM
.
5.
Clear the ELAT bit.
2.7.3 EPROM Erasing
The erased state of an EPROM bit is logic 0. Erase the EPROM by exposing it to 15 Ws/cm
2
of ultraviolet
light with a wavelength of 2537 angstroms. Position the ultraviolet light source one inch from the EPROM.
Do not use a shortwave filter.
Address:
$0018
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
0
ELAT
MPGM
EPGM
Write:
R
R
R
R
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
R
= Reserved
Figure 2-3. EPROM Programming Register (EPROG)
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