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ST62E20C bảng dữ liệu(PDF) 8 Page - STMicroelectronics |
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8 / 70 page 8/70 ST62T08C/T09C ST62T10C/T20C/E20C 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 ST6208C/09C/10C/20C 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). 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. ST6208C/09C/10C/20C Data Memory Space RESER VED 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 RESER VED 0C2h RESER VED 0C3h PORT A DIRECTION REGISTE R 0C4h PORT B DIRECTION REGISTE R 0C5h RESER VED 0C6h RESER VED 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WINDOW REGISTER 0C9h* RESER VED 0CAh 0CBh PORT A OPTION REGISTER 0CCh PORT B OPTION REGISTER 0CDh RESER VED 0CEh RESER VED 0CFh A/D DATA REGIS TER(except ST62T08C) 0D0h A/D CONTROL REGIS TER (except ST62T08C) 0D1h TIMER PRESCALER REGISTER 0D2h TIMER COUNTE R REGISTE R 0D3h TIMER STATU S CONTRO L REGISTER 0D4h RESER VED 0D5h 0D6h 0D7h WATCH DOG REGISTER 0D8h RESER VED 0D9h 0FEh ACCUMULATOR 0FFh * WRITE ONLY REGISTER 8 |
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