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| 型号： | M68HC12A4EVB |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | Primarily as an Expanded Mode Microcontroller |
| 中文描述： | 主要作为扩展单片机模式 |
| 文件页数： | 2/4页 |
| 文件大小： | 194K |
| 代理商： | M68HC12A4EVB |
Engineering Bulletin
EB350
2
MOTOROLA
Hardware Setup
Setting up the A4EVB in special expanded narrow mode requires
modifying the evaluation board.
Follow these steps to make the modification:
When setting up the evaluation board, turn off the power to the
A4EVB.
Jumpers W42 and W34 should be shunted between pins 1 and 2.
W30 should be left floating or pulled out.
Remove the 74HC32 chip from U3.
Make a wire jumper from pin 2 on U3 socket to pin 3. This will
make a direct connection from the RAM-CS signal to
RAM-MSB-CS. Chip enable (CE) on pin 22 will have a direct
connection to chip select header W11.
Select CSP0 by shunting W11-8 between pin 2 and pin 3. CSP0
is enabled from reset and should be used to test the application
program properly.
Insert RAM chip in socket U6B. Notice that U6A does not have
address line 0 routed, and it is used for expanded wide mode. On
the other hand, U6B does have address line 0 routed directly and
is designed for the use of expanded narrow mode.
When memory paging is enabled, the EVB includes the footprint
for a 28- and 32-pin RAM footprint. Address lines 16 and 18 are
hardwired to U6B. However, address line 17 needs to be
configured via jumper header W12 by shunting pin 3 and pin 4.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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