M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 21

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Memory Space Expansion Functions
Memory Space Expansion Features
Table 1.8.1. The way of setting memory space expansion modes and corresponding memory spaces
Figure 1.8.1. The memory maps and the chip select areas in normal mode
Here follows the description of the memory space expansion function.
With the processor running in memory expansion mode or in microprocessor mode, the memory space
expansion features provide the means of expanding the accessible space. The memory space expansion
features run in one of the three modes given below.
Use bits 5 and 4 (PM15, PM14) of processor mode register 1 to select a desired mode. The external
memory area the chip select signal indicates is different in each mode so that the accessible memory space
varies. Table 1.8.1 shows how to set individual modes and corresponding accessible memory spaces. For
external memory area the chip select signal indicates, see Table 1.12.1 on page 33.
Normal mode (no expansion)
Expansion mode 1
Expansion mode 2
Here follows the description of individual modes.
(1) Normal mode (a mode with memory not expanded)
‘Normal mode’ means a mode in which memory is not expanded.
Figure 1.8.1 shows the memory maps and the chip select areas in normal mode.
(1) Normal mode (no expansion)
(2) Memory space expansion mode 1 (to be referred as expansion mode 1)
(3) Memory space expansion mode 2 (to be referred as expansion mode 2)
XXXXX
YYYYY
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
Note 2: The memory maps in single-chip mode are omitted.
Expansion mode
D0000
FFFFF
00000
00400
04000
08000
28000
30000
M30622M4
M30620M8
M30620MC/EC
M30622M8/E8
M30622MC
M30620MA
M30622MA
M30624MG/FG
Type No.
16
16
16
16
16
16
16
16
16
16
Normal mode (memory area = 1M bytes for PM15 = 0, PM14 = 0)
Memory expansion mode
instance in which PM13 is set to 1.
Internal area reserved
Internal area reserved
Internal ROM area
Internal RAM area
External area
SFR area
Address XXXXX
02BFF
02BFF
02BFF
00FFF
013FF
017FF
017FF
053FF
16
16
16
16
16
16
16
16
16
Address YYYYY
F8000
F0000
E8000
E0000
F0000
E8000
E0000
C0000
How to set PM15 and PM14
16
16
16
16
16
16
16
16
Microprocessor mode
Internal area reserved
16
Internal RAMarea
External area
SFR area
0, 0
1, 0
1, 1
CS0
CS3
CS2
CS1
Memory expansion mode: 640K bytes
Microprocessor mode: 832K bytes
(16K bytes)
(32K bytes)
(128K bytes)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Up to 1M byte
Up to 1.2M bytes
Up to 4M bytes
Accessible memory space
Mitsubishi microcomputers
M16C / 62 Group
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