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參數資料
型號: MC68HC05X4DW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數: 18/156頁
文件大小: 926K
代理商: MC68HC05X4DW
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
18
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Bootloader mode
for the
MC68HC705X4
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 MC68HC705X4and the
Figure 2. MC68HC05X4 bootloader flowchart
PC RAMST + 1
Read next serial byte
from PA0 into RAM
Boot
PA2 = 1
PA3 = 1
Load
Read serial byte
‘COUNT’
Last byte
Execute user code
in RAM
Output contents of
user ROM on port B.
Yes
No
Yes
Yes
No
No
Test
Execute
6-modes
F
Freescale Semiconductor, Inc.
n
.
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