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M37640M8-126FP Datasheet(PDF) 8 Page - Mitsubishi Electric Semiconductor |
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M37640M8-126FP Datasheet(HTML) 8 Page - Mitsubishi Electric Semiconductor |
8 / 96 page 8 Ver 1.4 MITSUBISHI MICROCOMPUTERS 7640 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 1.11 MEMORY MAP The first 112 bytes of memory from 000016 to 006F16 is the special function register (SFR) area and con- tains the CPU mode registers, interrupt registers, and other registers to control peripheral functions (see Figure 1.7). The general purpose RAM resides from 007016 to 046F16. When the MCU is in memory expansion or microprocessor mode and external memory is over- laid on the internal RAM, the CPU reads data from the internal RAM. However, the CPU writes data in both the internal and external memory. The area from 047016 to 7FFF16 is not used in single-chip mode, but can be mapped for an external memory device when the MCU is in memory expansion or microprocessor mode. The area from 800016 to 807F16 and from FFFC16 to FFFF16 are factory reserved areas. Mitsubishi uses it for test and evaluation purposes. The user can not use this area in single-chip or memory expansion modes. The user 32K byte ROM resides from 808016 to FFFB16. When the MCU is in microprocessor mode, the CPU accesses an external area rather than ac- cessing the internal ROM. 1.11.1 Special page The 256 bytes from address FF0016 to FFFF16 are called the special page area. In this area special page addressing can be used to specify memory ad- dresses. This dedicated special page addressing mode enables access to this area with fewer instruc- tion cycles. Frequently used subroutines are normally stored in this area. Fig. 1.7. Memory Map SFR Area Reserved Area Zero Page Special page for subroutine calls Not Used Reserved Area 000016 006F16 007016 00FF16 010016 046F16 047016 7FFF16 800016 807F16 808016 FEFF16 FF0016 FFC916 FFCA16 FFFB16 FFFC16 FFFF16 RAM 1K bytes ROM Interrupt Vector bytes 32K |
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