M16C65 Datasheet, PDF (188/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
10. Processor Mode
10.2 Registers
Table 10.3 Register Structure
Address
Register Name
0004h Processor Mode Register 0
Symbol
PM0
0005h
0010h
Processor Mode Register 1
Program 2 Area Control Register
PM1
PRG2C
10.2.1 Processor Mode Register 0 (PM0)
After Reset
0000 0000b (CNVSS pin is low)
0000 0011b (CNVSS pin is high)
0000 1000b
XXXX XX00b
Processor Mode Register 0
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
PM0
Bit Symbol
Address
0004h
Bit Name
After Reset
0000 0000b (CNVSS pin is held low)
0000 0011b (CNVSS pin is held high)
Function
RW
PM00
b1 b0
RW
0 0 : Single-chip mode
Processor mode bit
0 1 : Memory expansion mode
1 0 : Do not set
PM01
1 1 : Microprocessor mode
RW
PM02 R/W mode select bit
0 : RD, BHE, WR
1 : RD, WRH, WRL
RW
PM03 Software reset bit
Setting this bit to 1 resets the MCU.
Read as 0.
RW
PM04
b5 b4
0 0 : Multiplexed bus is unused
RW
Multiplexed bus space select
(separate bus in the entire CS space)
bit
0 1 : Allocated to CS2 space
PM05
1 0 : Allocated to CS1 space
RW
1 1 : Allocated to the entire CS space
PM06
Port P4_0 to P4_3 function
select bit
0 : Address output
1 : Port function (address is not output)
RW
0 : BCLK is output
PM07 BCLK output disable bit
1 : BCLK is not output
RW
(pin is left in high-impedance)
Rewrite this register after setting the PRC1 bit in the PRCR register to 1 (write enabled).
Bits PM01 to PM00 do not change at software reset, watchdog timer reset, oscillation stop detection
reset, voltage monitor 1 reset, and voltage monitor 2 reset.
PM01 to PM00 (Processor Mode Bit) (b1 to b0)
Do not rewrite bits PM01 to PM00 and PM07 to PM02 at the same time.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 153 of 791