M16C User Manual.pdf

External ROMMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER6.4 Processor ModeThe external ROM version is operated only in microprocessor mode, so be sure to perform the following:• Connect CNVSS pin to VCC.• Fix the processor mode bit to “112”Figure 6.4.1 shows the processor mode register 0.Processor mode register 0 (Note)b7 b6 b5 b4 b3 b2 b1 b011Symbol Address When resePM0 000416 0316Bit symbolPM00PM01Bit nameProcessor mode bitFunctionb1 b00 0: Inhibited0 1: Inhibited1 0: Inhibited1 1: Microprocessor modePM02 R/W mode select bit 0 : RD,BHE,WR1 : RD,WRH,WRLPM03 Software reset bitThe device is reset when this bit is setto “1”. The value of this bit is “0” whenread.PM04PM05PM06PM07Multiplexed bus spaceselect bitPort P40 to P43 functionselect bitBCLK output disable bitb5 b40 0 : Multiplexed bus is not used0 1 : Allocated to CS2 space1 0 : Allocated to CS1 space1 1 : Inhibited0 : Address output1 : Port function(Address is not output)0 : BCLK is output1 : BCLK is not output(Pin is left floating)R WNote: Set bit 1 of the protect register (address 000A16) to “1” when writing newvalues to this register.Figure 6.4.1. Processor mode register 0553