AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 6
Manufacturer Part Number
Specifications of AT89C5131A-L
Max. Operating Frequency
Max I/o Pins
Self Program Memory
Operating Voltage (vcc)
3.0 to 3.6
Port4 (only bit0 and bit1)
The Hardware Condition configuration are stored in three bytes called P1_CF, P3_CF, P4_CF.
These bytes can be modified by the user through a set of API or through an ISP command.
There is a priority between P1_CF, P3_CF and P4_CF (see Figure 4 on page 9).
AT89C5131A USB Bootloader
The BLJB must be at 0 (programmed) to be able to restart the bootloader.
If the BLJB is equal to 1 (unprogrammed) only the hardware parallel programmer can change this
bit (see AT89C5131A datasheet for more details).