M16C62_M Datasheet, PDF (570/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

External ROM
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
5.4 Processor Mode
The external ROM version is operated only in microprocessor mode, so be sure to perform the following:
• Connect CNVSS pin to VCC.
Figure 5.4.1 shows the processor mode register 0.
Processor mode register 0 (Note)
b7 b6 b5 b4 b3 b2 b1 b0
11
Symbol
PM0
Address
000416
When rese
0316
Bit symbol
PM00
Bit name
Processor mode bit
PM01
PM02
PM03
R/W mode select bit
Software reset bit
PM04
PM05
PM06
PM07
Multiplexed bus space
select bit
Port P40 to P43 function
select bit
BCLK output disable bit
Function
b1 b0
0 0: Single-chip mode
0 1: Memory expansion mode
1 0: Must not be set
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 : Must not be set
0 : Address output
1 : Port function
(Address is not output)
0 : BCLK is output
1 : BCLK is not output
(Pin is left floating)
Note: Set bit 1 of the protect register (address 000A16) to “1” when writing new
values to this register.
Figure 5.4.1. Processor mode register 0
2-253