Atmel AT89C51SND1C User Manual page 13

3.1 Keypad
Assignment
3.2 Firmware
Upgrade
3.3 Start-Up
Firmware Package User Guide
Figure 3-1 shows the board's keypad assignment, one key is left free of functionality for
user's usage.
Figure 3-1. Keypad Assignment
A hidden operating mode is available to upgrade the firmware without using the ISP
hardware condition. This mode is entered by pressing simultaneously the grayed key as
shown in Figure 3-1 while powering the board or pressing the reset button. The upgrade
screen is then displayed to inform user of boot loader execution.
Figure 3-2. Firmware Upgrade Screen
Firmware can then be upgraded using the generic Atmel FLIP tool.
The AT89C51SND1C firmware starts with a splash screen giving the version
firmware (see Figure 3-3). This screen is displayed during few seconds but can be
skipped by pressing any key.
Note: 1. Version displayed is composed of three digits:
– First digit gives the major revision number.
– Second digit gives the minor revision number and a state of the revision:
even= stable version
odd= non stable version (used during developments)
– Third digit gives the patch revision number.
Operating Description
MODE
Firmware Upgrade
Operating Description
Section 3
(1)
of the
3-11
4209A–MP3–12/02