參數(shù)資料
型號: MC68HC05X4CDWR2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 79/168頁
文件大?。?/td> 656K
代理商: MC68HC05X4CDWR2
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
18
Modes of Operation and Pin Descriptions
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
MC68HC705X4 and the
Figure 2. MC68HC05X4 bootloader flowchart
PC RAMST + 1?
Read next serial byte
from PA0 into RAM
Boot
PA2 = 1
?
PA3 = 1
?
Read serial byte
‘COUNT’
Last byte
?
Execute user code
in RAM
Output contents of
user ROM on port B.
Yes
No
Yes
No
Test
Execute
Load
6-modes
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