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ST6235BQ6 Datasheet(PDF) 10 Page - STMicroelectronics |
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ST6235BQ6 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 82 page 10/82 ST62T35B/E35B 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 ST6235B and ST62E35B 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 00ST62T35B and ST62E35Bh 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. ST62T35B Data Memory Space Device RAM EEPROM ST62T35B 2 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 PORT C DATA REGIS TER 0C2h PORT D DATA REGIS TER 0C3h PORT A DIRECTION REGISTER 0C4h PORT B DIRECTION REGISTER 0C5h PORT C DIREC TION REGISTER 0C6h PORT D DIREC TION REGISTER 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WINDOW REGIS TER 0C9h* ROM BANK SELECT REGISTER 0CAh* RAM/EEPROM BANK SELECT REGISTER 0CBh* PORT A OPTION REGISTER 0CCh PORT B OPTION REGISTER 0CDh PORT C OPTION REGISTER 0CEh PORT D 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 RESERVED 0D5h UART DATA SHIFT REGISTE R 0D6h UART STATUS CONTROL REGIST ER 0D7h WATCHDOG REGISTER 0D8h RESERVED 0D9h I/O INTE RRUPT POLARITY REGISTER 0DAh OSCILLATOR CONTROL REGISTER 0DBh SPI INTERRUPT DISABLE REGISTER 0DCh* SPI DATA REGISTER 0DDh RESERVED 0DEh EEPROM CONTROL REGISTER 0DFh ARTIM16 COMPARE MASK REG. LOW BYTE MASK 0E0h ARTIM16 2ND STATUS CONTROL REGISTER SCR2 0E1h ARTIM16 3RD STATUS CONTROL REGISTER SCR3 0E2h ARTIM16 4TH STATUS CONTROL REGISTER SCR4 0E3h ARTIM16 1ST STATUS CONTROL REGISTER SCR1 0E8h ARTIM16 RELOAD CAPTUR E REG. HIGH BYTE RLCP 0E9h ARTIM16 RELOAD CAPTURE REG. LOW BYTE RLCP 0EAh ARTIM16 CAPT URE REGISTER HIGH BYTE CP 0EBh ARTIM16 CAPTURE REGISTER LOW BYTE CP 0ECh ARTIM16COMPAREVALUE REGISTE RHIGH BYTE CMP 0EDh ARTIM 16 COMPARE VALUE REGISTER LOWBYTE CMP 0EEh ARTIM 16 COMPARE MASK REG. HIGH BYTE MASK 0EFh RESE RVED 0F0h 0FBh PORT E DATA REGISTER OFCh PORT E DIRECTION REGISTER 0FDh PORT E OPTION REGISTE R 0FEh ACCUMULATOR OFFh * WRITE ONLY REGISTER 9 |
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