MC68HC05X4 Datasheet, PDF (22/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Modes of Operation and Pin Descriptions
Bootloader
PB2 = 0 ? ^No
Yes
Put RAMSUB
in RAM
(Reserved)
(Reserved)
PB3 = 1 ?
Yes
No
PB4 = 1 ?
Yes
Set count
to $0F00
No
No
PB4 = 1 ?
Yes
PROG/VERF
(Reserved)
A
Get byte
from port A
Program byte;
JSR NXTADR
End address ^No
($1FFF) ?
Verify
Change instruction
STA to EOR
Increment count to $0F00;
Start addr ¨ $0F00
Get byte from Port A;
JSR RAMSUB
Equal ? ^No
Yes
JSR NXTADR
End address _No
($1FFF) ?
Yes
VERF LED on
A
WAIT
Figure 5. MC68HC705X4 bootloader flowchart
MC68HC05X4 Rev 1.0
Modes of Operation and Pin Descriptions
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10-modes