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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

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AT89C5131A arduino
Physical Layer
www.DataSheet4U.com
The USB norm specifies all the transfers over the USB line. The USB specification also includes
several CLASS and SUB-CLASS specifications. These stand-alone documents are used by the
manufacturer to implement a USB link between a PC and a device supporting the In System
Programming. Mostly, the USB specification is implemented by hardware (automatic reply,
handshakes, timings, ...) and the USB Classes and SubClasses are implemented by software at
a data level.
Figure 5. USB Bus Topography
Downstream Transfer: OUT
PC Driver
PC Application
PC (Host)
Upstream Transfer: IN
Device driver/API
Firmware
USB Line
Application (Device)
48 MHz Frequency
Auto-Configuration
The USB is used to transmit information that has the following configuration:
• USB DFU using the Default Control Endpoint only (endpoint 0) with a 32 bytes length.
• 48 MHz for USB controller: USB clock configuration performed by the bootloader
The bootloader includes a function which will automatically setup the PLL frequency (48MHz)
versus the different XTAL configuration used on the application.
The table below shows the allowed frequencies compatible with the USB bootloader
48 MHz auto-generation.
6 MHz
X1 or X2
Clock
Modes
OK
8 MHz 12 MHz 16 MHz 20 MHz 24 MHz 32 MHz 40 MHz 48 MHz
OK OK OK OK OK OK OK OK
10 AT89C5131A USB Bootloader
4287E–USB–04/08

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