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M37534M4-XXXFP Datasheet(PDF) 9 Page - Renesas Technology Corp |
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M37534M4-XXXFP Datasheet(HTML) 9 Page - Renesas Technology Corp |
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9 / 55 page  7534 Group Rev.2.00 Jun 21, 2004 page 9 of 54 REJ03B0099-0200Z FUNCTIONAL DESCRIPTION Central Processing Unit (CPU) The 7534 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 cannot be used. 3. The WIT instruction can be used. 4. The STP instruction can be used. [CPU Mode Register] CPUM The CPU mode register contains the stack page selection bit. This register is allocated at address 003B16. Note on stack page When 1 page is used as stack area by the stack page selection bit, the area which can be used as stack depends on RAM size. Espe- cially, be careful that the RAM area varies in Mask ROM version, One Time PROM version and Emulator MCU. Fig. 9 Switching method of CPU mode register 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. 8 Structure of CPU mode register CPU mode register (CPUM: address 003B16) Stack page selection bit 0 : 0 page 1 : 1 page Main 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 on-chip oscillator 1 1 : f( φ) = f(XIN) (Double-speed mode) Not used (returns “0” when read) (Do not write “1” to these bits ) Processor mode bits b1 b0 0 0 Single-chip mode 0 1 1 0 1 1 Not available b7 b0 Switch the clock division ratio selection bits (bits 6 and 7 of CPUM) After releasing reset Main routine Start with an on-chip oscillator (Note) Switch to other mode except an on-chip oscillator (Select one of 1/1, 1/2, and 1/8) Note. After releasing reset the operation starts by starting an on-chip oscillator automatically. Do not use an on-chip oscillator at ordinary operation. Wait until establish ceramic oscillator clock. |
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