MC68HC705K1 Datasheet, PDF (84/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

EPROM/OTPROM
Freescale Semiconductor, Inc.
9.3 EPROM Programming Register
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.
Address: $0018
Bit 7
6
5
4
3
2
1
Bit 0
Read:
R
R
R
R
R
ELAT MPGM EPGM
Write:
Reset: U
U
U
U
U
0
0
0
R = Reserved
U = Unaffected
Figure 9-1. EPROM Programming Register (EPROG)
ELAT — EPROM Bus Latch Bit
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.
1 = Address and data buses configured for EPROM/OTPROM
programming
0 = Address and data buses configured for normal operation
MPGM — Mask Option Register (MOR) Programming Bit
This read/write bit applies programming power from the IRQ/V_PP pin
to the MOR. Reset clears MPGM.
1 = MOR programming power switched on
0 = MOR programming power switched off
EPGM — EPROM Programming Bit
This read/write bit applies the voltage from the IRQ/V_PP pin to the
EPROM/OTPROM. To write the EPGM bit, the ELAT bit must already
be set. Reset clears EPGM.
1 = EPROM/OTPROM programming power switched on
0 = EPROM/OTPROM programming power switched off
Technical Data
EPROM/OTPROM
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MC68HC705K1 — Rev. 2.0