AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 2

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Functional
Description
In-System
Programming
Capability (IAP)
In-Application
Programming or
Self Programming
Capability (ISP)
Block Diagram
2
AT89C5131A USB Bootloader
The AT89C5131A bootloader facilitates In-System Programming and In-Application
Programming.
In-System Programming allows the user to program or reprogram a microcontroller on-chip
Flash memory without removing it from the system and without the need of a pre-programmed
application.
The USB bootloader can manage a communication with a host through the USB bus. It can also
access and perform requested operations on the on-chip Flash memory.
In-Application Programming (IAP) allows the reprogramming of a microcontroller on-chip Flash
memory without removing it from the system and while the embedded application is running.
The USB bootloader contains some Application Programming Interface routines named API rou-
tines that allow IAP by using the user’s firmware.
This section describes the different parts of the bootloader. Figure 1 shows the on-chip boot-
loader and IAP processes.
Figure 1. Bootloader Process Description
External Host Via the
Communication
USB Protocol
ISP Communication
Management
Flash Memory
Management
Memory
Flash
Management
User Call
IAP
Application
On-chip
4287E–USB–04/08
User