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ST6225CN3 датащи(PDF) 8 Page - STMicroelectronics |
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ST6225CN3 датащи(HTML) 8 Page - STMicroelectronics |
8 / 70 page 8/70 ST62T15C/T25C/E25C 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 OTP/ EPROM. 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 OTP/EPROM. 1.3.3.2 Data RAM In ST6225 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 peripheral data and control registers, the interrupt option register and the Data ROM Window register (DRW register). 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 1. ST6225 Data Memory Space RESERVED 000h 03Fh DATA ROM WINDOW AREA 64 BYTES 040h 07Fh X REGISTER 080h Y REGISTER 081h V REGISTER 082h W REGISTER 083h DATA RAM 60 BYTES 084h 0BFh PORT A DATA REGISTE R 0C0h PORT B DATA REGISTE R 0C1h PORT C DATA REGISTER 0C2h RESERVED 0C3h PORT A DIRECTION REGISTER 0C4h PORT B DIRECTION REGISTER 0C5h PORT C DIRECTI ON REGISTER 0C6h RESERVED 0C7h INTERRUPT OPTI ON REGISTE R 0C8h* DATA ROM WINDOW REGISTER 0C9h* RESERVED 0CAh 0CBh PORT A OPTION REGISTER 0CCh PORT B OPTION REGISTER 0CDh PORT C OPTION REGISTE R 0CEh RESERVED 0CFh A/D DATA REGISTER 0D0h A/D CONTROL REGISTER 0D1h TIMER PRES CALER REGISTER 0D2h TIMER COUNTE R REGISTE R 0D3h TIMER STATUS CONTROL REGISTER 0D4h RESERVED 0D5h 0D6h 0D7h WATCHDOG REGIS TER 0D8h RESERVED 0D9h 0FEh ACCUMULATOR 0FFh * WRITE ONLY REGISTER 8 |
Аналогичный номер детали - ST6225CN3 |
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Аналогичное описание - ST6225CN3 |
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