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9 / 86 page 9/86 ST62T53C/T60C/T63C ST62E60C 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/EEPROM In ST62T53C, T60C, T63C and ST62E60C devic- es, 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 regis- ters, the peripheral data and control registers, the interrupt option register and the Data ROM Win- dow 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 1. Additional RAM/EEPROM Banks Table 2. ST62T53C, T60C, T63C and ST62E60C Data Memory Space Device RAM EEPROM ST62T53C 1 x 64 bytes - ST62T60C/E60C 1 x 64 bytes 2 x 64 bytes ST62T63C 1 x 64 bytes 1 x 64 bytes RAM and EEPROM 000h 03Fh DATA ROM WINDOW AREA 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 AR TIMER MODE CONTROL REGISTER 0D5h AR TIMER STA TUS/CONT ROL REGISTE R1 0D6h AR TIMER STA TUS/CONT ROL REGISTE R2 0D7h WATCHDOG REGIS TER 0D8h AR TIMER RELOAD/CAPTU RE REGISTE R 0D9h AR TIMER COMPARE REGIS TER 0DAh AR TIMER LOAD REGIS TER 0DBh OSCILLATOR CONTROL REGIS TER 0DCh* MISCELLANEOUS 0DDh RESERVED 0DEh 0DFh SPI DATA REGISTER 0E0h SPI DIVIDER REGIS TER 0E1h SPI MODE REGISTER 0E2h RESERVED 0E3h 0E7h DATA RAM/EEP ROM REGIS TER 0E8h* RESERVED 0E9h EEPR OM CONTROL REGISTER (except ST62T53C) 0EAh RESERVED 0EBh 0FEh ACCUMULATOR 0FFh * WRITE ONLY REGISTER 9 |
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