MC68HC705J1ACPE Datasheet, PDF (39/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
Memory
EPROM/OTPROM
2.6.2 EPROM Programming Register
The EPROM programming register (EPROG) contains the control bits
for programming the EPROM/OTPROM.
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)
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
MC68HC705J1A — Rev. 4.0
Memory
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Technical Data