W78E054D Datasheet, PDF (62/89 Pages) List of Unclassifed Manufacturers – 8-bit microcontroller

W78E054D/W78E052D Data Sheet
18 ISP (IN-SYSTEM PROGRAMMING)
ISP is the ability of program MCU to be programmed while F/W code in AP-ROM or LD-ROM. (Note:
Timer 0 for program, erase, read on ISP mode. ISP operation voltage 3.3- 5.5V)
START
Part 1:2KB APROM
procedure of entering
In-System Programming Mode
Enter In-System
Programming Mode ?
(conditions depend on
user's application)
NO
Execute the normal
Application program
YES
Setting control registers
MOV SFRCN,#3Fh
MOV SFRFD,#ABh
MOV SFRAL,#FFh
MOV SFRAH,#FFh
MOV CHPCON,#03h
END
Setting Timer (about 450 us)
and enable timer interrupt
Start Timer and enter idle Mode.
(CPU will be wakened from idle mode
by timer interrupt, then enter In-System
GO
Programming mode)
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Publication Release Date: Jun 9, 2015
Revision A13