Datasheet

20
7764A–8051–11/07
3.2 In-System Programming does not work
Possible root cause External Code Internal Code
MCU is not working in ISP mode
NOT
APPLICABLE
Apply the hardware condition. See “In-System Programming (ISP)” on page
14. and read the device’s bootloader datasheet.
MCU does not work properly
Monitor power supplies, XTAL2, RST, EA, ALE, PSEN ( See “MCU not
starting or operating in a reliable way” on page 19.)
Device is damaged Try a new or another device