MC68HC705V12CFN MOTOROLA [Motorola, Inc], MC68HC705V12CFN Datasheet - Page 124

• Manufacturer Part Number: MC68HC705V12CFN
• Description: The Motorola microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

EPROM and EEPROM
12.6 EPROM Programming Register
Advance Information
124
NOTE:
Address:
This register is used to program the EPROM array. To program a byte
of EPROM, set ELAT, write data to the desired address, then set EPGM
for t
MORON — Mask Option Register On Bit
ELAT — EPROM Latch Control Bit
The EPROM array cannot be read while this bit is set.
EPGM — EPROM Program Control Bit
Reset:
Read:
Write:
This bit enables and disables the decoding of the MOR.
The contents of the MOR register can be read/written only if this bit is
set and is available in any operating mode. This bit must be set when
the MOR byte is being programmed.
This bit latches the address and data bus when a write to the EPROM
array is performed.
This bit controls the programming voltage to the EPROM array.
EPGM cannot be set if ELAT is not already set. EPGM is cleared
automatically when ELAT = 0.
EPGM
1 = The MOR contents are placed into the memory map at location
0 = The first byte of boot ROM will be read from location $3C00.
1 = EPROM address and data bus configured for programming
0 = EPROM address and data bus configured for normal reads
1 = Programming power switched on to the EPROM array
0 = Programming power switched off to the EPROM array
Figure 12-2. EPROM Programming Register (EPROG)
MORON
$000D
BIt 7
.
$3C00.
0
EPROM and EEPROM
= Unimplemented
R
6
0
0
R
5
0
0
R
R
4
0
0
= Reserved
R
3
0
0
MC68HC705V12
ELAT
2
0
1
0
0
MOTOROLA
—
Rev. 3.0
EPGM
Bit 0
0