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9 / 84 page 9/84 ST62T28C/E28C 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 In ST6228C and ST62E28C 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 pages can also be addressed us- ing banks of 64 bytes located between 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 Banks Table 4. ST62T28C/E28C Data Memory Space Device RAM ST62T28C/E28C 2 x 64 bytes DATA RAM BANKS 000h 03Fh DATA ROM WINDOW AREA 040h 07Fh X REGISTER 080h Y REGISTER 081h V REGISTER 082h W REGIS TER 083h DATA RAM 084h 0BFh PORT A DATA REGISTER 0C0h PORT B DATA REGISTER 0C1h PORT C DATA REGISTE R 0C2h PORT D DATA REGISTE R 0C3h PORT A DIRECTION REGISTE R 0C4h PORT B DIRECTION REGISTE R 0C5h PORT C DIRECT ION REGISTE R 0C6h PORT D DIRECT ION REGISTE R 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WIND OW REGISTE R 0C9h* ROM BANK SELECT REGISTE R 0CAh* RAM BANK SELECT REGISTE R 0CBh* PORT A OPTION REGISTER 0CCh PORT B OPTION REGISTER 0CDh PORT C OPTION REGISTER 0CEh PORT D OPTION REGISTER 0CFh A/D DATA REGIS TER 0D0h A/D CONTROL REGIS TER 0D1h TIMER 1 PRESCALE R REGISTER 0D2h TIMER 1 COUNTE R REGISTER 0D3h TIMER 1 STATUS/CONTROL REGISTER 0D4h RESERVED 0D5h UART DATA SHIFT REGISTER 0D6h UART STATUS CONTROL REGISTER 0D7h WATCHDOG REGISTER 0D8h RESERVED 0D9h I/O INTER RUPT POLARITY REGIS TER 0DAh SPI INTERRUPT DISAB LE REGISTE R 0DCh* SPI DATA SHIFT REGISTER 0DDh RESERVED 0DEh 0E4h ARTIMER MODE/CONTROL REGIS TER 0E5h ARTIME R STATUS/CONTROL REGISTER ARSC0 0E6h ARTIME R STATUS/CONTROL REGISTER ARSC1 0E7h RESE RVED 0E8h ARTIMER RELOAD/CAPTURE REGIST ER 0E9h ARTIMER COMPARE REGISTER 0EAh . ARTIMER LOAD REGISTER 0EBh RESE RVED 0ECh ACCUMULATOR OFFh * WRIT E ONLY REGISTER 9 |
Số phần tương tự - ST6228CM6 |
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Mô tả tương tự - ST6228CM6 |
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