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M37271MF-231SP Datasheet(PDF) 9 Page - Mitsubishi Electric Semiconductor |
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M37271MF-231SP Datasheet(HTML) 9 Page - Mitsubishi Electric Semiconductor |
9 / 97 page MITSUBISHI MICROCOMPUTERS M37271MF-XXXSP M37271EF-XXXSP, M37271EFSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER 9 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 OSD RAM for display is used for specifying the character codes and col- ors to display. ROM for OSD 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. Fig. 2. Memory map 000016 00C016 00FF16 0FFF16 SFR1 area Not used FFFF16 FFDE16 FF0016 080016 Interrupt vector area Not used 1080016 1FFFF16 Special page ROM (60 K bytes) RAM for OSD (Note) (1920 bytes) RAM (1024 bytes) Zero page 020016 023F16 100016 SFR2 area 053F16 Not used 030016 Not used 1567F16 1800016 Not used 1E43F16 1000016 ROM for OSD (14464 bytes) |
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