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| MC68HC05L28 Datasheet, PDF (135/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer | |||
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A
MC68HC705L28
This appendix summarises the differences between the MC68HC05L28 and the MC68HC705L28.
The same information can also be found in appropriate sections of the book.
The MC68HC705L28 is an EPROM version of the MC68HC05L28. The 8176 bytes of user ROM
in the MC68HC05L28 are replaced by 8128 bytes of user EPROM.
A.1
Features
⢠8128 bytes of user EPROM
⢠RAM bootloader is different to the RAM bootloader in the MC68HC05L28
⢠EPROM bootloader mode
A.2
Modes of operation
The MC68HC705L28 also has two modes of operation â single chip and EPROM/RAM bootloader.
Table A-1 shows the conditions required to enter each mode on the rising edge of RESET.
Table A-1 MC68HC705L28 operating mode entry conditions
IRQ0/VPP PB2 PB3 PB6
Mode
VSS to VDD
x
VTST
0
VTST
0
VTST
1
VTST
1
x
x Single chip
0
VDD EPROM bootloader Verify only
1
V DD
Program/verify
0
VDD RAM bootloader
Jump to RAM ($81)
1
V DD
Load/execute RAM
MC68HC05L28
MC68HC705L28
TPG
MOTOROLA
A-1
15
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