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ST6246BB6 Datasheet(PDF) 10 Page - STMicroelectronics |
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ST6246BB6 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 72 page 10/72 ST62T46B/E46B 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/EEPROM In ST62T46B and ST62E46B 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 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. ST62T46B/E46B Data Memory Space Device RAM EEPROM ST62T46B/E46B 1 x 64 bytes 2 x 64 bytes DATA and EEPROM 000h 03Fh DATA ROM WINDOW AREA 040h 07Fh X REGIS TER 080h Y REGIS TER 081h V REGIS TER 082h W REGISTE R 083h DATA RAM 084h 0BFh PORT A DATA REGISTER 0C0h PORT B DATA REGISTER 0C1h SPI INTERRUPT DISA BLE REGISTER 0C2h PORT C DATA REGISTER 0C3h PORT A DIRECTION REGIS TER 0C4h PORT B DIRECTION REGIS TER 0C5h PORT C DIRECTION REGISTER 0C6h RESERVED 0C7h INTERRUPT OPTION REGISTER 0C8h* DATA ROM WIND OW REGISTER 0C9h* RESERVED 0CAh* RAM/EEPROM BANK SELECT REGISTER 0CBh* PORT A OPTION REGISTER 0CCh RESERVED 0CDh PORT B OPTION REGISTER 0CEh PORT C OPTION REGISTE R 0CFh A/D DATA REGISTE R 0D0h A/D CONTROL REGIS TER 0D1h TIMER 1 PRESCALER REGIS TER 0D2h TIMER 1 COUNTE R REGISTER 0D3h TIMER 1 STATUS/CONTROL REGISTER 0D4h TIMER 2 PRESCALER REGIS TER 0D5h TIMER 2 COUNTE R REGISTER 0D6h TIMER 2 STATUS/CONTROL REGISTER 0D7h WATCHDOG REGISTER 0D8h RESERVED 0D9h PSS STATUS/CONTROL REGISTER 0DAh 32kHz OSCILLATOR CONTROL REGISTER 0DBh LCD MODE CONTROL REGISTER 0DCh SPI DATA REGISTER 0DDh RESERVED 0DEh EEPROM CONTROL REGISTER 0DFh LCD RAM 0E0h 0F7h DATA RAM 0F8h 0FEh ACCUMULATOR OFFh * WRITE ONLY REGISTER 346 |
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