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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(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 569K |
| 代理商： | SS-90S8515-P |
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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
1.3.3 Block 1 – Equinox ISP Programmer
This block represents an Equinox programmer featuring ISP. The diagram shows the key signals that the programmer provides
to allow the Socket Stealer to function correctly. /RESET controls the reset of the microcontroller (block 3), /SS, MOSI, MISO
and SCK are all used for programming of the microcontroller and PROG is used to control connection of the ISP signals to the
target circuit (block 5). When PROG is active the switches are open. When an operation such as programming, erasing, etc. is
not taking place all the signals from the programmer are high impedance.
1.3.4 Block 2 – Reset Circuit
This block represents the reset circuit which is based on a RC network with some logic. The purpose of the circuit is to
combine both the reset from the target board (block 5) and the reset from the programmer (block 1) into one signal for the
microcontroller (block 3). This allows the microcontroller to be reset by both the programmer (during ISP) and the target board
(for example on power up).
1.3.5 Block 3 – ISP Enabled Microcontroller
This block represents the microcontroller that is plugged into the Socket Stealer. It must be an Atmel AT89S device such as the
AT89S8252 or an Atmel AT90S4414/8515. Most of the I/O is connected straight to the target circuit (block 5). The ISP signals
(/SS, MOSI, MISO and SCK) connect directly to the programmer (block 1) and through analogue switches (block 4) to the
target circuit (block 5).
1.3.6 Block 4 – Analogue Switches
These switches allow the programmer (block 1) to control when the ISP pins of the microcontroller (/SS, MOSI, MISO and
SCK) are connected to the target circuit or not. During programming the PROG signal is active and the switches are open
thereby disconnecting the ISP pins from the target circuit (block 5). This avoids any driver contention problems. When
programming is not taking place or the programmer is disconnected the switches are closed thereby allowing the pins to be
used for normal I/O.
1.3.7 Block 5 – Target Circuit Microcontroller Socket
This block represents the socket on the target board where the microcontroller normally plugs in. When the Socket Stealer is
being used it plugs into this socket instead. When an operation such as programming, erasing, etc. is not taking place the
microcontroller on the Socket Stealer is effectively plugged into this socket.
1.4 Advantages of the Design
Problems associated with designing In-System Programmable circuits have been removed
Allows hardware on the SPI bus (/SS, MOSI, MISO and SCK) to be used with interfering with programming
Adds In-System Programmability to existing designs that do not have this feature
Target circuit redesign is not required
Makes field upgradable firmware possible and easy to perform
Enables designs to convert from an 8051 microcontroller to an AVR microcontroller more easily. Allows the crystal to be
easily changed and the existing 8051 reset circuit can be used
1.5 Design Notes
The use of analogue switches results in a series resistance being introduced on four of the microcontroller I/O lines. This could
cause I/O port loading problems with some existing boards. Please refer to section 4 for further information on the analogue
switch resistance.
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