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ST62E65CF1 Datenblatt(PDF) 9 Page - STMicroelectronics |
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9 / 86 page 9/86 ST62T55C ST62T65C/E65C 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 ST62T55C, ST62T65C and ST62E65C 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. ST62T55C, ST62T65C and ST62E65C Data Memory Space Device RAM EEPROM ST62T55C 1 x 64 bytes - ST62T65C/E65C 1 x 64 bytes 2 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 REGISTER 0C0h PORT B DATA REGISTER 0C1h PORT C DATA REGISTER 0C2h RESERVED 0C3h PORT A DIRECTION REGISTER 0C4h PORT B DIRECTION REGISTER 0C5h PORT C DIRECTION REGISTER 0C6h RESERVED 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WINDOW REGISTER 0C9h* RESERVED 0CAh 0CBh PORT A OPTION REGISTER 0CCh PORT B OPTION REGISTER 0CDh PORT C OPTION REGISTER 0CEh RESERVED 0CFh A/D DATA REGISTER 0D0h A/D CONTROL REGISTER 0D1h TIMER PRESCALER REGISTER 0D2h TIMER COUNTER REGISTER 0D3h TIMER STATUS CONTROL REGISTER 0D4h AR TIMER MODE CONTROL REGISTER 0D5h AR TIMER STATUS/CONTROL REGISTER1 0D6h AR TIMER STATUS/CONTROL REGISTER2 0D7h WATCHDOG REGISTER 0D8h AR TIMER RELOAD/CAPTURE REGISTER 0D9h AR TIMER COMPARE REGISTER 0DAh AR TIMER LOAD REGISTER 0DBh OSCILLATOR CONTROL REGISTER 0DCh* MISCELLANEOUS 0DDh RESERVED 0DEh 0DFh SPI DATA REGISTER 0E0h SPI DIVIDER REGISTER 0E1h SPI MODE REGISTER 0E2h RESERVED 0E3h 0E7h DATA RAM/EEPROM REGISTER 0E8h* RESERVED 0E9h EEPROM CONTROL REGISTER 0EAh RESERVED 0EBh 0FEh ACCUMULATOR 0FFh * WRITE ONLY REGISTER |
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