M16C Datasheet, PDF (22/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PBruosceCsosnotroMl ode
Processor mode register 0 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
PM0
Address
000416
When reset
0016 (Note 2)
Bit symbol
Bit name
PM00
Processor mode bit
PM01
PM02
PM03
R/W mode select bit
Software reset bit
PM04
PM05
Multiplexed bus space
select bit
Function
b1 b0
0 0: Single-chip mode
0 1: Memory expansion mode
1 0: Inhibited
1 1: Microprocessor mode
RW
0 : RD,BHE,WR
1 : RD,WRH,WRL
The device is reset when this bit is set
to “1”. The value of this bit is “0” when
read.
b5 b4
0 0 : Multiplexed bus is not used
0 1 : Allocated to CS2 space
1 0 : Allocated to CS1 space
1 1 : Allocated to entire space (Note4)
PM06
PM07
Port P40 to P43 function
select bit (Note 3)
BCLK output disable bit
0 : Address output
1 : Port function
(Address is not output)
0 : BCLK is output
1 : BCLK is not output
(Pin is left floating)
Note 1: Set bit 1 of the protect register (address 000A16) to “1” when writing new
values to this register.
Note 2: If the VCC voltage is applied to the CNVSS, the value of this register when
reset is 0316. (PM00 and PM01 both are set to “1”.)
Note 3: Valid in microprocessor and memory expansion modes.
Note 4: If the entire space is of multiplexed bus in memory expansion mode, choose an 8-
bit width.The processor operates using the separate bus after reset is revoked, so the entire
space multiplexed bus cannot be chosen in microprocessor mode.
The higher-order address becomes a port if the entire space multiplexed bus is chosen, so
only 256 bytes can be used in each chip select.
Processor mode register 1 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
0
0
Symbol
PM1
Address
000516
When reset
00000XX02
Bit symbol
Reserved bit
Bit name
Function
Must always be set to “0”
RW
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns
out to be indeterminate.
PM13
Internal reserved area
expansion bit (Note 2)
0: The same internal reserved
area as that of M16C/60 and
M16C/61 group
1: Expands the internal RAM area
and internal ROM area to 23 K
bytes and to 256K bytes
respectively. (Note 2)
PM14
PM15
Memory area
expansion bit (Note 3)
b5 b4
0 0 : Normal mode
(Do not expand)
0 1 : Inhibited
1 0 : Memory area expansion
mode 1
1 1 : Memory area expansion
mode 2
Reserved bit
Must always be set to “0”
PM17
Wait bit
0 : No wait state
1 : Wait state inserted
Note 1: Set bit 1 of the protect register (address 000A16) to “1” when writing new values to this register.
Note 2: Be sure to set this bit to 0 except products whose RAM size and ROM size exceed 15K bytes
and 192K bytes respectively.
Set this bit to "1" for M306N0FG.
Specify E000016 or a subsequent address, which becomes an internal ROM area if PM13 is set
to “0” at the time reset is revoked, for the reset vector table of user program.
Note 3: With the processor running in memory expansion mode or in microprocessor mode, setting this
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”.
Figure 3-3. Processor mode register 0 and 1
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