Atmel AT89C51SND1C, Руководство пользователя

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Operating Description
Firmware Package User Guide 3-11
4209A–MP3–12/02
Section 3
Operating Description
3.1 Keypad
Assignment
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
3.2 Firmware
Upgrade
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.
3.3 Start-Up
The AT89C51SND1C firmware starts with a splash screen giving the version
(1)
of the
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.
MODE
Firmware Upgrade