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ST62E45B Datenblatt(PDF) 10 Page - STMicroelectronics |
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ST62E45B Datenblatt(HTML) 10 Page - STMicroelectronics |
10 / 72 page 10/72 ST62T45B/E45B MEMORY MAP (Cont’d) 1.3.3 Data Space Data Space accommodates all the data necessary for processing the user program. This space com- prises the RAM resource, the processor core and peripheral registers, as well as read-only data such as constants and look-up tables in Program memory. 1.3.3.1 Data ROM All read-only data is physically stored in program memory, which also accommodates the Program Space. The program memory consequently con- tains the program code to be executed, as well as the constants and look-up tables required by the application. The Data Space locations in which the different constants and look-up tables are addressed by the processor core may be thought of as a 64-byte window through which it is possible to access the read-only data stored in Program memory. 1.3.3.2 Data RAM/EEPROM In ST62T45B and ST62E45B devices, the data space includes 60 bytes of RAM, the accumulator (A), the indirect registers (X), (Y), the short direct registers (V), (W), the I/O port registers, the pe- ripheral data and control registers, the interrupt option register and the Data ROM Window regis- ter (DRW register). Additional RAM and EEPROM pages can also be addressed using banks of 64 bytes located be- tween addresses 00h and 3Fh. 1.3.4 Stack Space Stack space consists of six 12-bit registers which are used to stack subroutine and interrupt return addresses, as well as the current program counter contents. Table 2. Additional RAM/EEPROM Banks. Table 3. ST62T45B/E45B Data Memory Space Device RAM EEPROM ST62T45B/E45B 1 x 64 bytes 2 x 64 bytes DATA and EEPROM 000h 03Fh DATA ROM WINDOW AREA 040h 07Fh X REGISTER 080h Y REGISTER 081h V REGISTER 082h W REGISTER 083h DATA RAM 084h 0BFh PORT A DATA REGISTER 0C0h PORT B DATA REGISTER 0C1h SPI INTERRUPT DISABLE REGISTER 0C2h PORT C DATA REGIS TER 0C3h PORT A DIRECTION REGISTER 0C4h PORT B DIRECTION REGISTER 0C5h PORT C DIREC TION REGISTER 0C6h RESERVED 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WINDOW REGIS TER 0C9h* RESERVED 0CAh* RAM/EEPROM BANK SELECT REGISTER 0CBh* PORT A OPTION REGISTER 0CCh RESERVED 0CDh PORT B OPTION REGISTER 0CEh PORT C OPTION REGISTER 0CFh A/D DATA REGISTER 0D0h A/D CONTROL REGIS TER 0D1h TIMER 1 PRESC ALER REGISTER 0D2h TIMER 1 COUNTER REGIS TER 0D3h TIMER 1 STATUS/CONTROL REGISTER 0D4h TIMER 2 PRESC ALER REGISTER 0D5h TIMER 2 COUNTER REGIS TER 0D6h TIMER 2 STATUS/CONTROL REGISTER 0D7h WATCHDOG REGISTER 0D8h RESERVED 0D9h RESERVED 0DAh 32kHz OSCILLATOR CONTROL REGISTE R 0DBh LCD MODE CONTROL REGISTER 0DCh SPI DATA REGISTER 0DDh RESERVED 0DEh EEPROM CONTROL REGISTER 0DFh LCD RAM 0E0h 0F7h DATA RAM 0F8h 0FEh ACCUMULATOR OFFh * WRITE ONLY REGISTER 9 |
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