7220 Datasheet, PDF (190/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.3 Usage example of ROM correction function (M37221M8/MA-XXXSP)
5.3.3 E²PROM map
Figures 5.3.4 and 5.3.5 show the E²PROM map when using the ROM correction function. To store correction
codes by using both ROM correction functions 1 and 2, the capacity of E²PROM needs to be approximately
70 bytes.
E²PROM
address
00016
00116
00216
00316
00416
00516
00616
00716
00816
00916
00A16
00B16
00C16
00D16
00E16
00F16
01016
01116
01216
01316
01416
01516
01616
01716
01816
01916
01A16
01B16
01C16
01D16
01E16
01F16
02016
02116
02216
Contents
ROM correction function 1 Valid/invalid
(55H: valid, others: invalid)
ROM correction function 1
Execution address (high-order)
ROM correction function 1
Execution address (low-order)
ROM correction function 1 Correction code 1
ROM correction function 1 Correction code 2
ROM correction function 1 Correction code 3
ROM correction function 1 Correction code 4
ROM correction function 1 Correction code 5
ROM correction function 1 Correction code 6
ROM correction function 1 Correction code 7
ROM correction function 1 Correction code 8
ROM correction function 1 Correction code 9
ROM correction function 1 Correction code 10
ROM correction function 1 Correction code 11
ROM correction function 1 Correction code 12
ROM correction function 1 Correction code 13
ROM correction function 1 Correction code 14
ROM correction function 1 Correction code 15
ROM correction function 1 Correction code 16
ROM correction function 1 Correction code 17
ROM correction function 1 Correction code 18
ROM correction function 1 Correction code 19
ROM correction function 1 Correction code 20
ROM correction function 1 Correction code 21
ROM correction function 1 Correction code 22
ROM correction function 1 Correction code 23
ROM correction function 1 Correction code 24
ROM correction function 1 Correction code 25
ROM correction function 1 Correction code 26
ROM correction function 1 Correction code 27
ROM correction function 1 Correction code 28
ROM correction function 1 Correction code 29
ROM correction function 1 Correction code 30
ROM correction function 1 Correction code 31
ROM correction function 1 Correction code 32
Stored data
Instructions in
(Machine instruction) correction program
55H
E1H
20H
A9H
80H
1AH
8DH
12H
01H
1AH
8DH
13H
01H
4CH
26H
E1H
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
EAH
4CH
XXH
YYH
LDA #80H
DEC A
STA 0112H
DEC A
STA 0113H
JMP E126H
NOP (see note)
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
JMP YYXXH
Set reset vector
address to YYXXH
(see note).
Note: When operating normally, this instruction is not executed. This is a redundant processing to
reset during program runaway.
Fig. 5.3.4 E²PROM map when using ROM correction function (1)
Refer to
“Figure 5.3.2”
7220 Group User’s Manual
5-17