Common notes
Example of application note
Microcontrollers Atmel AVR and AT89Sxxx series
This application note is used in T51prog. This interface
corresponds with Atmel application note AVR910: In-System
Programming. This application note describes the
recommended ISP interface connector layout in target system
(top view).
1
2
34
5
6
Vcc
RESET
MISO
SCK MOSI
GND
Description of required pins for in-system programming
by AVR910.
Pin Name Comment
SCK Serial Clock Programming clock, generated by the In-
System programmer (master).
MOSI Master Out – Slave In Communication line from In-System
programmer (master) to target MCU
being programmed (slave).
MISO Master In – Slave Out Communication line from target MCU
(slave) to In-System programmer
(master).
GND Common Ground The two systems must share the same
common ground.
RESET Target MCU Reset To enable In-System programming, the
target MCU Reset must be kept active.
To simplify this, the In-System
programmer should control the target
MCU Reset
Vcc Target Power To allow simple programming of targets
operating at any voltage, the In-System
programmer can draw power from the
target. Alternatively, the target can have
power supplied through the In-System
programming connector for the duration
of the programming cycle
153
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