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W78E516B-24 Datasheet(PDF) 11 Page - Winbond |
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W78E516B-24 Datasheet(HTML) 11 Page - Winbond |
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11 / 26 page  W78E516B Publication Release Date: February 2000 - 11 - Revision A3 Part 2: 4KB LDROM Procedure of Updating the 64KB APROM Go Timer Interrupt Service Routine: Stop Timer & disable interrupt Is F04KBOOT Mode? (CHPCON.7=1) Reset the CHPCON Register: MOV CHPENR,#87H MOV CHPENR,#59H MOV CHPCON,#03H No Yes Setting Timer and enable Timer interrupt for wake-up . (15 ms for erasing operation) Setting erase operation mode: MOV SFRCN,#22H (Erase 64KB APROM) Start Timer and enter IDLE Mode. (Erasing...) End of erase operation. CPU will be wakened by Timer interrupt. PGM PGM Setting Timer and enable Timer interrupt for wake-up . (50us for program operation) End of Programming ? Get the parameters of new code (Address and data bytes) through I/O ports, UART or other interfaces. Is currently in the F04KBOOT Mode ? Setting control registers for programming: MOV SFRAH,#ADDRESS_H MOV SFRAL,#ADDRESS_L MOV SFRFD,#DATA MOV SFRCN,#21H Software reset CPU and re-boot from the 64KB APROM. MOV CHPENR,#87H MOV CHPENR,#59H MOV CHPCON,#83H END Executing new code from address 00H in the 64KB APROM. Hardware Reset to re-boot from new 64 KB APROM. (S/W reset is invalid in F04KBOOT Mode) Yes No Yes No |
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