MC68HC11PH8 Datasheet, PDF (77/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

PH8.DS03/Modes+mem
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[DS97 v 4.1] 08/Apr/97@13:55
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If the security feature is present and enabled and bootstrap mode is selected, then the following
sequence is performed by the bootstrap program:
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1) Output $FF on the SCI.
2) Turn block protect off. Clear BPROT register.
3) If EEPROM is enabled, erase it all.
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4) Verify that the EEPROM is erased; if not, begin sequence again.
5) Write $FF to every RAM byte.
6) Erase the CONFIG register.
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If all the above operations are successful, the bootloading process continues as if the device has
not been secured.
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CONFIG — System configuration register
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
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ConÞguration control (CONFIG) $003F ROMAD FREEZ CLK4X PAREN NOSEC NOCOP ROMON EEON xxxx xxxx
For a description of the other bits contained in the CONFIG register refer to Section 3.3.2.1.
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NOSEC — EEPROM security disabled
1 (set) – Disable security.
0 (clear) – Enable security.
With security enabled, selection of special test mode is prevented; single chip and user expanded
modes may be accessed. If the MODA and MODB pins are configured for special test mode, the
part will start in bootstrap mode.
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MC68HC11PH8
OPERATING MODES AND ON-CHIP MEMORY
¬^TPG
MOTOROLA
3-31
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