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M37540M4-XXXSP Datasheet(PDF) 8 Page - Mitsubishi Electric Semiconductor |
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M37540M4-XXXSP Datasheet(HTML) 8 Page - Mitsubishi Electric Semiconductor |
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8 / 64 page  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 7540 Group MITSUBISHI MICROCOMPUTERS 8 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. FUNCTIONAL DESCRIPTION Central Processing Unit (CPU) The 7540 Group uses the standard 740 family instruction set. Refer to the table of 740 family addressing modes and machine-language instructions or the 740 Family Software MANUAL for details on each instruction set. Machine-resident 740 family instructions are as follows: 1. The FST and SLW instructions cannot be used. 2. The MUL and DIV instructions can be used. 3. The WIT instruction can be used. 4. The STP instruction can be used. (This instruction cannot be used while CPU operates by a ring oscil- lator.) [CPU mode register] CPUM The CPU mode register contains the stack page selection bit. This register is allocated at address 003B16. Switching method of CPU mode register Switch the CPU mode register (CPUM) at the head of program after releasing Reset in the following method. Fig. 9 Switching method of CPU mode register Fig. 8 Structure of CPU mode register Oscillation mode selection bit (Note 1) 0 : Ceramic oscillation 1 : RC oscillation CPU mode register (CPUM: address 003B 16) Stack page selection bit 0 : 0 page 1 : 1 page Clock division ratio selection bits b7 b6 0 0 : f( φ) = f(XIN)/2 (High-speed mode) 0 1 : f( φ) = f(XIN)/8 (Middle-speed mode) 1 0 : applied from ring oscillator 1 1 : f( φ) = f(XIN) (Double-speed mode)(Note 2) Ring oscillator oscillation control bit 0 : Ring oscillator oscillation enabled 1 : Ring oscillator oscillation stop XIN oscillation control bit 0 : Ceramic or RC oscillation enabled 1 : Ceramic or RC oscillation stop Processor mode bits (Note 1) b1 b0 0 0 Single-chip mode 0 1 1 0 1 1 Not available b7 b0 2: These bits are used only when a ceramic oscillation is selected. Note 1: The bit can be rewritten only once after releasing reset. After rewriting it is disable to write any data to the bit. However, by reset the bit is initialized and can be rewritten, again. (It is not disable to write any data to the bit for emulator MCU “M37540RSS”.) Do not use these when an RC oscillation is selected. After releasing reset Switch the oscillation mode selection bit (bit 5 of CPUM) Switch the clock division ratio selection bits (bits 6 and 7 of CPUM) Main routine Start with a built-in ring oscillator An initial value is set as a ceramic oscillation mode. When it is switched to an RC oscillation, its oscillation starts. Switch to other mode except a ring oscillator. At the same time, select the double-speed, high-speed, or middle-speed mode. Wait by ring oscillator operation until establishment of oscillator clock When using a ceramic oscillation, wait until establlishment of oscillation from oscillation starts. When using an RC oscillation, wait time is not required basically (time to execute the instruction to switch from a ring oscillator meets the requirement). |
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Similar Description - M37540M4-XXXSP |
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