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M37733S4LHP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M37733S4LHP Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 37 page  10 MITSUBISHI MICROCOMPUTERS M37733S4LHP 16-BIT CMOS MICROCOMPUTER New product PROCESSOR MODE The bits 0 of processor mode register 0 as shown in Figure 8 is used to select which mode of microprocessor mode, and evaluation chip mode. Figure 9 shows functions of P00/A0 to P47 pins in each mode. The external memory area also changes when the mode changes. Figure 10 shows the memory map for each mode. The accessing of the external memory is affected by the BYTE pin, the bit 2 (wait bit) of processor mode register 0, and bit 0 (wait selection bit) of processor mode register 1. • BYTE pin When accessing the external memory, the level of the BYTE pin is used to determine whether to use the data bus as 8-bit width or 16- bit width. The data bus width is 8 bits when the level of the BYTE pin is “H”, and P20/A16/D0 to P27/A23/D7 pins become the data I/O pins. The data bus width is 16 bits when the level of the BYTE pin is “L”, and both P20/A16/D0 to P27/A23/D7 pins and P10/A8/D8 to P17/A15/ D15 pins become the data I/O pins. When accessing the internal memory, the data bus width is always 16 bits regardless of the BYTE pin level. Fig. 8 Processor mode register bit configuration Not used Processor mode bit 0 : Microprocessor mode 1 : Evaluation chip mode Wait bit 0 : Wait 1 : No Wait Software reset bit Reset occurs when this bit is set to “1” Interrupt priority detection time selection bit 0 0 : Internal clock ! 7 0 1 : Internal clock ! 4 1 0 : Internal clock ! 2 This bit must be “0” 76 5 43 2 0 1 0 Processor mode register 0 Address 5E16 Address 5F16 Processor mode register 1 Wait selection bit 0 : Wait 0 1 : Wait 1 76 5 43 2 0 1 1 This bit must be “1” (becomes “1” after reset release) |
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