Datasheet

15
7764A–8051–11/07
Figure 2-1. HPC hardware condition
2.2 LPC package
2.2.1 Hardware settings
There are no specific hardware settings to apply.
2.2.2 Starting the ISP mode
Software condition:
Normally the BSB (Boot Status Byte) is activated (0xFF) at manufacturing level on new chips to
have the device run in ISP mode at first power on. When the BSB is active, the user does not
need to apply the hardware condition described here after. It may be useful at customer’s pro-
duction level for instance. The BSB is deactivated (0x00) by the bootloader after the first
programming. It is then the responsability of the user to re-activate it.
ALE
EA
VCC
Standard C51
/PSEN
RST
VCC
GND
1K
Unconnected
VCC
VSS
VCC
GND
GND
C1
C2
Crystal
GND
XTAL2
XTAL1
UART / USB / CAN interfaces
PC running FLIP
Bootloader
WARNING
For LPC packages the BLJB bit is activated at manufacturing level and MUST NEVER be
changed by the user. If this ever occurs, the only way to restore the ISP mode is to re-pro-
gram the device by an external programmer.