mc68hc705k1 Freescale Semiconductor, Inc, mc68hc705k1 Datasheet - Page 84

• Manufacturer Part Number: mc68hc705k1
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

EPROM/OTPROM
9.3 EPROM Programming Register
Technical Data
Address:
The EPROM programming register (EPROG) contains the control bits
for programming the EPROM/OTPROM. In normal operation, the
EPROM programming register is a read-only register that contains all
logic 0s.
ELAT — EPROM Bus Latch Bit
MPGM — Mask Option Register (MOR) Programming Bit
EPGM — EPROM Programming Bit
Reset:
Read:
Write:
This read/write bit configures address and data buses for
programming the EPROM/OTPROM array. EPROM/OTPROM data
cannot be read when ELAT is set. Clearing the ELAT bit also clears
the EPGM bit. Reset clears ELAT.
This read/write bit applies programming power from the IRQ/V
to the MOR. Reset clears MPGM.
This read/write bit applies the voltage from the IRQ/V
EPROM/OTPROM. To write the EPGM bit, the ELAT bit must already
be set. Reset clears EPGM.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Address and data buses configured for EPROM/OTPROM
0 = Address and data buses configured for normal operation
1 = MOR programming power switched on
0 = MOR programming power switched off
1 = EPROM/OTPROM programming power switched on
0 = EPROM/OTPROM programming power switched off
Figure 9-1. EPROM Programming Register (EPROG)
$0018
Bit 7
programming
R
U
R
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= Reserved
EPROM/OTPROM
R
U
6
R
U
5
U = Unaffected
R
U
4
R
U
3
MC68HC705K1 — Rev. 2.0
ELAT
2
0
PP
MPGM
1
0
pin to the
PP
EPGM
Bit 0
0
pin