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31
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Processor Mode
Under
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Figure 1.6.2. PM1 Register
Processor mode register 1 (Note 1)
Symbol
Address
After reset
PM1
000516
0X0010002
Bit name
Function
Bit symbol
RW
b7
b6
b5
b4
b3
b2
b1
b0
CS2 area switch bit
(data block enable bit)
0: 0800016 to 26FFF16
(block A disable)
1: 1000016 to 26FFF16
(block A enable)
PM10
(Note 2)
RW
Port P37 to P34
function select bit
Note 1: Write to this register after setting the PRC1 bit in the PRCR register to “1” (write enable).
Note 2: For the mask ROM version, this bit must be set to “0” . For the flash memory version, the PM10 bit also
controls block A by enabling or disabling it. However, the PM10 bit is automatically set to “1” when the
FMR01 bit in the FMR0 register is “1” (CPU rewrite mode).
Note 3: Effective when the PM01 to PM00 bits are set to “012” (memory expansion mode) or “112” (microprocessor
mode).
Note 4: PM12 bit is set to “1” by writing a “1” in a program. (Writing a “0” has no effect.)
Note 5: When PM17 bit is set to “1” (with wait state), one wait state is inserted when accessing the internal RAM,
internal ROM, or an external area. If the CSiW bit (i = 0 to 3) in the CSR register is “0” (with wait state), the
CSi area is always accessed with one or more wait states regardless of whether the PM17 bit is set or not.
Where the RDY signal is used or multiplex bus is used, set the CSiW bit to “0” (with wait state).
Note 6: The access area is changed by the PM13 bit as listed in the table below.
PM17
Wait bit (Note 5)
0 : No wait state
1 : With wait state (1 wait)
Internal reserved area
expansion bit
PM13
See Note 6
Should be set to “0”.
0 : Watchdog timer interrupt
1 : Watchdog timer reset (Note 4)
Watchdog timer function
select bit
PM12
PM14
PM15
Memory area
expansion bit (Note 3)
0 0 : 1 Mbyte mode
(Do not expand)
0 1 : Must not be set
1 0 : Must not be set
1 1 : 4 Mbyte mode
b5 b4
PM11
(Note 3)
0 : Address output
1 : Port function
RW
(b6)
Access area
Internal
RAM
ROM
Up to addresses 0040016 to 03FFF16 (15 Kbytes)
Up to addresses D000016 to FFFFF16 (192 Kbytes)
PM13=0
PM13=1
The entire area is usable
External
Addresses 0400016 to 07FFF16 are usable
Addresses 8000016 to CFFFF16 are usable
Addresses 0400016 to 07FFF16 are reserved
Addresses 8000016 to CFFFF16 are reserved
Reserved bit
RW
0