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ST62E85B Datenblatt(PDF) 11 Page - STMicroelectronics |
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11 / 76 page 11/76 ST62T85B/E85B 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 ST62T85B and ST62E85B 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 register (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 3. Additional RAM/EEPROM Banks. Table 4. ST62T85B/E85B Data Memory Space Device RAM EEPROM LCD RAM ST62T85B/E85B 2 x 64 bytes 2 x 64 bytes 2 x 64 bytes DATA RAM/EEPROM, LCD RAM 000h 03Fh DATA ROM WINDOW AREA 040h 07Fh X REGIST ER 080h Y REGIST ER 081h V REGIST ER 082h W REGISTE R 083h DATA RAM 084h 0BFh PORT A DATA REGISTER 0C0h PORT B DATA REGISTER 0C1h SPI INTERRUPT DISABLE REGISTER 0C2h PORT C DATA REGISTER 0C3h PORT A DIRECTION REGISTER 0C4h PORT B DIRECTION REGISTER 0C5h PORT C DIRECTION REGISTE R 0C6h RESERVED 0C7h INTER RUPT OPTION REGISTER 0C8h* DATA ROM WINDOW REGISTE R 0C9h* ROM BANK SELECT REGISTER 0CAh* DATA RAM/EEPROM, LCD BANK SELECT REGISTER 0CBh* PORT A OPTION REGISTE R 0CCh RESERVED 0CDh PORT B OPTION REGISTE R 0CEh PORT C OPTION REGIS TER 0CFh A/D DATA REGIS TER 0D0h A/D CONTROL REGIST ER 0D1h TIMER 1 PRESCALER REGIS TER 0D2h TIMER 1 COUNTE R REGISTER 0D3h TIMER 1 STATUS/CONTROL REGISTER 0D4h RESERVED 0D5h UART DATA REGISTER 0D6h UART CONTRO L REGIS TER 0D7h WATCHDOG REGISTER 0D8h RESERVED 0D9h 0DAh 0DBh LCD MODE CONTROL REGISTE R 0DCh SPI DATA REGISTER 0DDh RESERVED 0DEh EEPROM CONTROL REGIS TER 0DFh RESERVED 0E0h 0E4h ARTIMER MODE/CON TROL REGISTER 0E5h ARTIMER STATUS/CONTROL REGISTER 0 0E6h ARTIMER STATUS/CONTROL REGISTER 1 0E7h RESERVED ARTIMER RELOAD/CAPTU RE REGIST ER 0E9h ARTIMER COMPARE REGISTE R 0EAh ARTIMER LOAD REGISTER 0EBh RESERVED 0ECh 0FEh ACCUMULATOR OFFh * WRIT E ONLY REGISTER 11 |
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