M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 527

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

512
External Buses
5.3 Memory Space Expansion Features
Figure 5.3.1. Processor mode register 1
Here follows the description of the memory space expansion function.
(1) Normal Mode
(2) Memory space expansion mode1 1.2M byte memory space
(3) Memory space expansion mode2 4M byte memory space
Use bits 5 and 4(PM15,PM14) of processor mode register 1 to select a desired mode.Figure 5.3.1 shows
the processor mode register 1.
Processor mode register 1 (Note 1)
b7
b6
0
b5
b4
b3
b2
b1
b0
0
Note 1: Set bit 1 of the protect register (address 000A
Note 2: Be sure to set this bit to 0 except products whose RAM size and ROM size exceed 15K bytes
Note 3: With the processor running in memory expansion mode or in microprocessor mode, setting this
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns
out to be
Bit symbol
Reserved bit
Reserved bit
PM13
PM14
PM15
PM17
Symbol
PM1
and 192K bytes respectively.
In using M30624MG/FG, a product having a RAM of more than 15K bytes and a ROM of more
than 192K bytes, set this bit to 1 at the beginning of user program.
Specify D0000
to “0” at the time reset is revoked, for the reset vector table of user program.
bit provides the means of expanding the external memory area. (Normal mode: up to 1M byte,
expansion mode 1: up to 1.2 M bytes, expansion mode 2: up to 4M bytes)
For details, see “Memory space expansion functions”.
indeterminate.
Wait bit
Internal reserved area
expansion bit (Note 2)
Memory area
expansion bit (Note 3)
1M byte memory space
16
Address
Bit name
0005
or a subsequent address, which becomes an internal ROM area if PM13 is set
16
When reset
00000XX0
b5 b4
0 0 : Normal mode
0 1 : Inhibited
1 0 : Memory area expansion
1 1 : Memory area expansion
0: The same internal reserved
1: Expands the internal RAM area
0 : No wait state
1 : Wait state inserted
Must always be set to “0”
Must always be set to “0”
area as that of M16C/60 and
M16C/61 group
and internal ROM area to 23 K
bytes and to 256K bytes
respectively. (Note 2)
(Do not expand)
mode 1
mode 2
2
16
) to “1” when writing new values to this register.
Function
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
R
W
Mitsubishi microcomputers
M16C / 62 Group