mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 18

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Bootloader mode
for the
MC68HC705X4
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
Read next serial byte
from PA0 into RAM
Execute user code
PC RAMST + 1?
Read serial byte
Load
Last byte
‘COUNT’
PA3 = 1
in RAM
?
?
Figure 2. MC68HC05X4 bootloader flowchart
This mode is used for programming the on-board EPROM and mask
option register. In bootloader mode the operation of the device is the
same as in single chip mode, except that the vectors are fetched from
the bootloader ROM (locations $1F01 to $1FEF) instead of the EPROM.
The pin assignments are therefore identical to that of single chip mode
shown earlier. Because the addresses in the MC68HC705X4 and the
Yes
Yes
Freescale Semiconductor, Inc.
For More Information On This Product,
Modes of Operation and Pin Descriptions
No
No
Go to: www.freescale.com
Yes
Execute
PA2 = 1
Boot
?
No
user ROM on port B.
Output contents of
Test
6-modes