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ST9040 Scheda tecnica(PDF) 55 Page - STMicroelectronics |
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ST9040 Scheda tecnica(HTML) 55 Page - STMicroelectronics |
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55 / 56 page  1.3 MEMORY The memory of the ST90R40 is functionallydivided into two areas, the Register File and Memory. The Memory may optionallybe divided into two spaces, each having a maximum of 65,536 bytes. The two memory spaces are separated by function, one space for Program code, the other for Data. The ST90R40 addresses all program memory in the external PROGRAM space. The DATA space in- cludes the 512 bytes of on-chip EEPROM at ad- dresses 0 through 1FFh and the 256 bytes of on-chip RAM memory at addresses 200h through 2FFh. The External Memory spaces are addressed using the multiplexed address and data buses on Ports 0 and 1. Data Memory may be decodedexternally by using the P/D Alternate Function output. The on- chip general purpose (GP) Registers may be used as RAM memory. Figure 3. Memory Spaces ® ST90R40 55/56 |
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