Filter
Top Products
520
CHAPTER 22 ADDRESS MATCH DETECTION FUNCTION
■ Operation of Address Match Detection Function at Storing Patch Program in E
2
PROM
Figure 22.4-4 shows the operation of the address match detection function at storing the patch program in
E
2
PROM.
Figure 22.4-4 Operation of Address Match Detection Function at Storing Patch Program in E
2
PROM
■ Flow of Patch Processing for Patch Program
Figure 22.4-5 shows the flow of patch processing for patch program using the address match detection
function.
ROM
RAM
000000
H
FFFFFF
H
Patch program
Detection address setting register
Detection address setting
(reset sequence)
Serial E
2
PROM
interface
E
2
PROM
• Patch program byte count
• Address for address detection
• Patch program
Program error
(1)
(2)
(3)
(4)
(1) Execution of detection address setting of reset sequence and normal program
(2) Branch to patch program which expanded in RAM with INT9 interrupt processing by address match detection
(3) Patch program execution by branching of INT9 processing
(4) Execution of normal program which branches from patch program