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AT89C51SND1 Reference Design User Guide 4-10
Rev. 4207B–MP3–04/07
Section 4
In-System Programming (ISP)
4.1 Using Hardware
Conditions
Two solder points or short-cuts have to be physically set up on the board in order to
enter this mode. This mode must be used when the initial software has been corrupted
and when the ISP cannot be activated by the keyboard.
Figure 4-1. ISP Hardware Condition
4.2 Using Software
Condition
When connected to a PC using a USB cable, the player can be accessed by Flexible In-
System Programming (FLIP) software. To enter by software in the ISP bootloader of the
player, press the Function button while the USB cable is plugged into the PC (the ISP
software condition is checked only during power ON Reset).
A driver has to be installed the first time (See FLIP installation note). This driver is deliv-
ered with Atmel FLIP software available on the Atmel Web site.
When connected, a new device will appear in the hardware window of the PC under the
"User interface peripheral" section, named USB_DFU_SND1. See FLIP User's guide for
information about FLIP execution.
Solder two SMD 0
Ω
resistors here (horizontally).
To activate the USB transfer and
To put hardware ISP conditions on the microcontroller.