M16C62_N Datasheet, PDF (38/621 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

Memory Space Expansion Functions
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(2) Expansion mode 1
In this mode, the memory space can be expanded by 176K bytes in addition to that in normal mode.
Figure 1.8.2 shows the memory location and chip select area in expansion mode 1.
_______ _______
_______
In accessing data in expansion mode 1, CS3, CS2, and CS1 go active in the area from 0400016 through
_______
2FFFF16; in fetching a program, CS0 goes active. That is, the address space is expanded by using the
________ _______ _______
area from 0400016 through 2FFFF16 (176K bytes) appropriately for accessing data (CS3, CS2, CS1)
_______
and fetching a program (CS0).
Expansion mode 1 (memory space = 1.2M bytes for PM15 = 1, PM14 = 0)
0000016
0040016
XXXXX16
0400016
Memory
expansion mode
SFR area
Internal RAM
area
Internal area reserved
0800016
Microprocessor
mode
SFR area
Internal RAM
area
Internal area reserved
CS3^{(16K bytes)}
CS2(128 Kbytes)
2800016
3000016
External area
D000016 _{Internal area reserved}
YYYYY16
FFFFF16
Internal ROM
area
External
area
CS1(32K bytes)
CS0
Memory expansion
mode:
816K bytes
Microprocessor mode:
1008K bytes
Type No.
M30622M4
M30620M8
M30620MA
M30620MC/EC
M30622M8/E8
M30622MA
M30622MC
M30624MG/FG
Address XXXXX16
00FFF16
02BFF16
02BFF16
02BFF16
013FF16
017FF16
017FF16
053FF16
Address YYYYY16
F800016
F000016
E800016
E000016
F000016
E800016
E000016
C000016
0400016
to
176K bytes
2FFFF16 = the extent of memory expanded
CS0:active in fetching a program
CS1, CS2, CS3:active in accessing data
3000016
to
FFFFF16
CS0:active both in fetching a program
and in accessing data
Note 1: These memory maps show an instance in which PM13 is set to 0; but in the case of M30624MG/FG, they show an
instance in which PM13 is set to 1.
Note 2: The memory maps in single-chip mode are omitted.
Figure 1.8.2. Memory location and chip select area in expansion mode 1
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