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M37221EFSP Datasheet(PDF) 7 Page - Mitsubishi Electric Semiconductor |
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M37221EFSP Datasheet(HTML) 7 Page - Mitsubishi Electric Semiconductor |
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7 / 63 page  M37221EF-XXXSP,M37221EFSP MITSUBISHI MICROCOMPUTERS SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER 7 MEMORY Special Function Register (SFR) Area The special function register (SFR) area in the zero page contains control registers such as I/O ports and timers. RAM RAM is used for data storage and for stack area of subroutine calls and interrupts. ROM ROM is used for storing user programs as well as the interrupt vector area. RAM for Display RAM for display is used for specifying the character codes and col- ors to display. ROM for Display ROM for display is used for storing character data. Interrupt Vector Area The interrupt vector area contains reset and interrupt vectors. Zero Page The 256 bytes from addresses 000016 to 00FF16 are called the zero page area. The internal RAM and the special function registers (SFR) are allocated to this area. The zero page addressing mode can be used to specify memory and register addresses in the zero page area. Access to this area with only 2 bytes is possible in the zero page addressing mode. Special Page The 256 bytes from addresses FF0016 to FFFF16 are called the spe- cial page area. The special page addressing mode can be used to specify memory addresses in the special page area. Access to this area with only 2 bytes is possible in the special page addressing mode. 000016 00C016 00FF16 01FF16 06B716 080016 SFR area ROM correction memory (RAM) Not used FFFF16 FFDE16 FF0016 060016 Interrupt vector area Not used 1000016 11FFF16 1FFFF16 ROM for display (8 K bytes) Special page ROM (62 K bytes) RAM for display (Note) (96 bytes) Zero page RAM (448 bytes) 05FF16 030016 RAM (768 bytes) 02FF16 02C016 021716 Not used 2 page register Not used 021B16 Note: Refer to Table 12. Contents of CRT display RAM. Fig. 2. Memory map |
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