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參數(shù)資料
| 型號(hào)： | SS-90S8515-P |
| 英文描述： | SOCKET STEALER AVR DIL |
| 中文描述： | 插座偷竊者AVR的迪爾 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 569K |
| 代理商： | SS-90S8515-P |
89S /AV R(90S )
S oc ket S tealer
Equinox Technologies UK Limited
UK Contact Details
3 Atlas House, St. Georges Square, Bolton BL1 2HB England
Tel: +44 (0) 1204 529000 Fax: +44 (0) 1204 535555
E-mail:
sales@equinox-tech.com
Web site:
www.equinox-tech.com
US/Canada Contact Numbers
Tel: 1-800-216-1777 Fax: 1-800-234-0941
2.3.2 Links B3 and B4 – Crystal Selection
It is possible to choose between using a crystal on the target system or a crystal plugged into the Socket Stealer using links B3
and B4. This option allows designs for one microcontroller family (8051 or AVR) to migrate more easily to the other
microcontroller family, as both families have different requirements for the crystal frequency. The crystal already on the target
system does not need to be removed to use a crystal on the Socket Stealer.
Connecting pads 1 and 2 together on both links B3 and B4 select the crystal on the target system. Connecting pads 2 and 3
together on both links B3 and B4 select the crystal on the Socket Stealer.
A simplified circuit diagram is shown below.
2.3.3 Link B5 - /EA and ICP Configuration
For 8051 devices the /EA pin selects between execution from internal or external memory. Link B5 allows this pin to be either
connected to /EA on the target circuit or directly to the supply voltage Vcc on the Socket Stealer (selecting execution from
internal memory).
Connecting pads 1 and 2 together on link B5 connects the /EA pin to the target system /EA. Connecting pads 2 and 3 together
on link B5 connects the /EA pin to Vcc.
When using the 40-pin to 20-pin 8051 adaptor the /EA pin must be tied to Vcc for correct operation. This is due to the 20-pin
8051 devices not featuring /EA so when the adaptor is connected and /EA is not tied to Vcc by setting link B5 to 2 – 3, the /EA
is left unconnected giving unreliable behaviour.
On AVR devices the ICP pin controls the timer/counter 1 Input Capture function. Link B5 allows this pin to be either
connected to the target circuit ICP or tied directly to Vcc on the Socket Stealer. If the input is being used then the pin should be
connected to the target circuit otherwise it should be held at a constant logic level, either on the target circuit or by connecting
the input directly to Vcc on the Socket Stealer.
Connecting pads 1 and 2 together on link B5 connects the ICP pin to the target system ICP. Connecting pads 2 and 3 together
on link B5 connects the ICP pin to Vcc.
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