MC68HC705JP7 Datasheet, PDF (184/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

EPROM/OTPROM
Freescale Semiconductor, Inc.
13.3 EPROM Registers
The EPROM programming register (EPROG) controls the actual
programming of the EPROM bytes and the mask option register (MOR).
The MOR controls eight mask options found on the read-only memory
(ROM) version of this microcontroller unit (MCU). There is an additional
EPROM bit (EPMSEC) located at the computer operating properly
(COP) address to provide EPROM array security.
13.3.1 EPROM Programming Register
The EPROM programming register (EPROG) shown in Figure 13-1
contains the control bits for programming the EPROM. In normal
operation, the EPROM programming register contains all logic 0s.
Address: $001C
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 for test
Figure 13-1. EPROM Programming Register (EPROG)
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 already be set.
Clearing the ELAT bit also clears the EPGM bit. Reset clears EPGM.
1 = EPROM programming power switched on
0 = EPROM programming power switched off
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
Advance Information
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MC68HC705JJ7 • MC68HC705JP7 — REV 4
EPROM/OTPROM
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