MC68HC705JP7 Datasheet, PDF (188/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

EPROM/OTPROM
Freescale Semiconductor, Inc.
COPEN — COP Watchdog Enable Bit
This EPROM bit enables the COP watchdog.
1 = COP watchdog enabled
0 = COP watchdog disabled
13.3.3 EPROM Security Bit
An EPROM programmable bit is provided at the location of the COP
watchdog register at $1FF0 as shown in Figure 13-3. This bit allows
control of access to the EPROM array. Any accesses of the EPROM
locations will return undefined results when the EPMSEC bit is set. Refer
to 13.4.2 EPMSEC Programming for programming instructions.
Address: $1FF0
Bit 7
6
5
4
3
2
1
Bit 0
Read:
OPT
Write: EPMSEC
COPC
Reset:
Unaffected by reset
Erased:
0
—
—
—
—
—
—
—
= Unimplemented
Figure 13-3. EPROM Security in COP and Security Register (COPR)
EPMSEC — EPROM Security¹
This EPROM write-only bit enables the access to the EPROM array.
1 = Access to the EPROM array in non-user modes is denied.
0 = Access to the EPROM array in non-user modes is enabled.
Advance Information
188
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the EPROM/OTPROM difficult for unauthorized users.
MC68HC705JJ7 • MC68HC705JP7 — REV 4
EPROM/OTPROM
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