Atmel AT89C51SND1 Section 4 In-System Programming (ISP)

AT89C51SND1 Reference Design User Guide 4-10

Rev. 4207B–MP3–04/07

Section 4In-System Programming (ISP)

Two solder points or sh ort-cuts have to be phy sically set up on the b oard in ord er to

enter this mode. This mode mus t be used when the initial softwar e has been corrupted

and when the ISP cannot be activated by the keyboard.

Figure 4-1. ISP Hardware 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 F unction button while the USB cable is p lugged 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.