MC68HC705J1A Motorola, MC68HC705J1A Datasheet - Page 39
Manufacturer Part Number
Specifications of MC68HC705J1A
2.6.2 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.
MPGM — MOR Programming Bit
This read/write bit applies programming power from the IRQ/V
to the mask option register. Reset clears MPGM.
EPGM — EPROM Programming Bit
This read/write bit applies the voltage from the IRQ/V
EPROM. To write the EPGM bit, the ELAT bit must be set already.
Reset clears EPGM.
MC68HC705J1A — Rev. 4.0
Figure 2-3. EPROM Programming Register (EPROG)
1 = Address and data buses configured for EPROM/OTPROM
programming the EPROM
0 = Address and data buses configured for normal operation
1 = Programming voltage applied to MOR
0 = Programming voltage not applied to MOR
1 = Programming voltage (IRQ/V
0 = Programming voltage (IRQ/V
R = Reserved
pin to the
pin) applied to EPROM
pin) not applied to EPROM