31
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Processor Mode
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
PM1
Address
0005
16
After reset
0X001000
2
Bit name
Function
Bit symbol
RW
b7
b6
0
b5
b4
b3
b2
b1
b0
CS2 area switch bit
(data block enable bit)
(Note 2)
0: 08000
16
to 26FFF
16
(block A disable)
1: 10000
16
to 26FFF
16
(block A enable)
PM10
RW
Port P3
7
to P3
4
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 “01
2
” (memory expansion mode) or “11
2
” (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)
(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
RW
RW
RW
RW
RW
(b6)
Access area
Internal RAM
ROM
Up to addresses 00400
16
to 03FFF
16
(15 Kbytes)
Up to addresses D0000
16
to FFFFF
16
(192 Kbytes)
Addresses 04000
16
to 07FFF
16
are usable
Addresses 80000
16
to CFFFF
16
are usable
PM13=0
PM13=1
The entire area is usable
The entire area is usable
Addresses 04000
16
to 07FFF
16
are reserved
Addresses 80000
16
to CFFFF
16
are reserved
External
Reserved bit
RW