Philips CEM2100/00 Service Manual page 351

Example :After chip erasure, the program in the RAM area writes data 3FH to address F000H.
DI
LD
LD
LD
LD
; #### Flash Memory Chip erase Process ####
LD
LD
LD
LD
LD
LD
sLOOP1: LD
CMP
JR
SET
; #### Flash Memory Write Process ####
LD
LD
LD
LD
sLOOP2: LD
CMP
JR
LD
sLOOP3: JP
: Disable interrupts (IMF←"0")
(FLSCR),00111000B : Enable command sequence execution.
IX,0F555H
IY,0FAAAH
HL,0F000H
(IX),0AAH : 1st bus write cycle
(IY),55H : 2nd bus write cycle
(IX),80H : 3rd bus write cycle
(IX),0AAH : 4th bus write cycle
(IY),55H : 5th bus write cycle
(IX),10H : 6th bus write cycle
W,(HL)
W,(HL)
NZ,sLOOP1 : Loop until the same value is read.
(FLSCR).3 : Set BANK1.
(IX),0AAH : 1st bus write cycle
(IY),55H : 2nd bus write cycle
(IX),0A0H : 3rd bus write cycle
(HL),3FH : 4th bus write cycle, (F000H)=3FH
W,(HL)
W,(HL)
NZ,sLOOP2 : Loop until the same value is read.
(FLSCR),11001000B : Disable command sequence execution.
sLOOP3
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