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PDF AT89C5131A Datasheet ( Hoja de datos )

Número de pieza AT89C5131A
Descripción USB Microcontrollers
Fabricantes ATMEL Corporation 
Logotipo ATMEL Corporation Logotipo
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AT89C5131A datasheet

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AT89C5131A pdf
AT89C5131A USB Bootloader
In-System
ISP allows the user to program or reprogram a microcontroller’s on-chip Flash memory through
Prowgwrwa.DmatamSheient4gU.com the USB bus without removing it from the system and without the need of a pre-programmed
application.
This section describes how to start the USB bootloader and the higher level protocol over the
USB.
Boot Process
The bootloader can be activated in two ways:
• Hardware conditions
• Regular boot process
Figure 3 and Figure 4 describe the boot process flows for low pin count and high pin count
products.
High Pin Count
Hardware Conditions
The Hardware conditions (EA = 1, PSEN = 0) during the RESET rising edge force the on-chip
bootloader execution. In this way the bootloader can be carried out regardless of the user Flash
memory content. It is recommended to pull the PSEN pin down to ground though a 1K resistor to
prevent the PSEN pin from being damaged (see Figure 2 below).
Figure 2. ISP Hardware conditions
VCC
VCC
VCC
EA
ALE
Unconnected
RST XTAL2
Bootloader
/PSEN
XTAL1
C2
GND
Crystal
GND
C1
1K
GND GND
VSS
GND
As PSEN is an output port in normal operating mode (running user application or bootloader
code) after reset, it is recommended to release PSEN after rising edge of reset signal. The hard-
ware conditions are sampled at reset signal rising edge, thus they can be released at any time
when reset input is high.
Low Pin Count
Hardware Conditions
The Hardware Condition forces the bootloader execution from reset.
The default factory Hardware Condition is assigned to port P1.
• P1 must be equal to FEh
In order to offer the best flexibility, the user can define its own Hardware Condition on one of the
following Ports:
• Port1
4287E–USB–04/08
5

5 Page

AT89C5131A arduino
AT89C5131A USB Bootloader
Figure 6. 48 MHz Frequency Auto-Configuration
www.DataSheet4U.com
MAIN
No Resume
Detected?
Yes
No USB Connected?
Suspend/Resume
Yes
Configure PLL for
Frequency X
Configure Timer 0
Yes SOF Detected?
No
Timer 0 Overflow?
No
Yes
Change Frequency
USB Scheduler
4287E–USB–04/08
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