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3.1
General Board
Description
3.1.1
RS-232 Serial
Interface
3.1.2
Control Section
®
AVR
In System Programmer User Guide
A block diagram of the AVRISP is shown in Figure 3-1. The AVRISP can be divided in
three sections: The RS-232 interface, the Control section and the ISP cable. In this sec-
tion a brief overview of the different blocks will be given.
Figure 3-1. Simplified AVRISP Block Schematics
RS-232
RxD
TxD
The AVRISP uses a standard female DSUB, RS-232 port for communication with the
front-end software (AVR Studio). It supports communication of 115200 baud.
The control MCU handles all communication between the target AVR and the front-end
software. The AVRISP is completely software controlled from AVR Studio. No manual
configuration of the ISP is needed.
Table 3-1. Status Led
Led Color
Red-Yellow-Green-Off-Green Cycle
Yellow
Red
Green
A 3-color LED indicates the status of the AVRISP. During programming the LED is yel-
low. When the target AVR is successfully programmed, the LED will turn green. If
programming fails, the LED will turn red to indicate that programming (or verification)
Hardware Description
RS-232 Interface
VTG
Level
VTG
RxD
TxD
GND
Section 3
Control Section
CTRL
MCU
Description
Power on Sequence
Busy – Programming
Programming Failed
Ready – OK
ISP Cable
VTG
MOSI
MISO
SCK
RESET
GND
3-1
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