AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 45

• 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

Application-
Programming-Interface
XROW Bytes
Hardware Conditions
High Pin Count Hardware
Conditions (PLCC52, QFP64)
4338F–USB–08/07
Several Application Program Interface (API) calls are available for use by an application
program to permit selective erasing and programming of Flash pages. All calls are made
by functions.
All these APIs are described in detail in the following document on the Atmel web site.
The EXTRA ROW (XROW) includes 128 bytes. Some of these bytes are used for spe-
cific purpose in conjonction with the bootloader.
Table 43. XROW Mapping
It is possible to force the controller to execute the bootloader after a Reset with hard-
ware conditions. Depending on the product type (low pin count or high pin count
package), there are two methods to apply the hardware conditions.
For high pin count packages, the hardware conditons (EA = 1, PSEN = 0) are sampled
during the RESET rising edge to force the on-chip bootloader execution (See Figure 82
on page 172). 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 24 below).
Figure 24. ISP Hardware conditions
Description
Copy of the Manufacturer Code
Copy of the Device ID#1: Family code
Copy of the Device ID#2: Memories size and type
Copy of the Device ID#3: Name and Revision
–
GND
Datasheet Bootloader USB AT89C5131.
1K
GND
VCC
/RST
EA
/PSEN
Bootloader
VCC
VSS
GND
VCC
XTAL2
XTAL1
ALE
Unconnected
C2
Crystal
C1
GND
GND
Default Value
D7h
BBh
FFh
58h
AT89C5131A-L
Address
30h
31h
60h
61h
45