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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ST72321AR7-Auto Datenblatt(PDF) 26 Page - STMicroelectronics |
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ST72321AR7-Auto Datenblatt(HTML) 26 Page - STMicroelectronics |
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26 / 243 page  Register and memory map ST72321xx-Auto 26/243 Doc ID 13829 Rev 1 3 Register and memory map As shown in Figure 4, the MCU is capable of addressing 64 Kbytes of memories and I/O registers. The available memory locations consist of 128 bytes of register locations, up to 2 Kbytes of RAM and up to 60 Kbytes of user program memory. The RAM space includes up to 256 bytes for the stack from 0100h to 01FFh. The highest address bytes contain the user reset and interrupt vectors. IMPORTANT: Memory locations marked as “Reserved” must never be accessed. Accessing a reserved area can have unpredictable effects on the device. Related documentation Executing Code in ST7 RAM (AN 985) Figure 4. Memory map 0000h RAM Program Memory (60K or 32K) Interrupt & Reset Vectors HW Registers 0080h 007Fh 0FFFh (see Table 4) 1000h FFDFh FFE0h FFFFh (see Table 20) 0880h Reserved 087Fh Short Addressing RAM (zero page) 256 Bytes Stack 16-bit Addressing RAM 0100h 01FFh 0080h 0200h 00FFh or 087Fh 32 KBytes 8000h 60 KBytes FFFFh 1000h (2048 or 1024 Bytes) or 067Fh or 047Fh Table 4. Hardware register map Address Block Register label Register name Reset status Remarks 0000h 0001h 0002h Port A PADR PADDR PAOR Port A Data Register Port A Data Direction Register Port A Option Register 00h(1) 00h 00h R/W R/W R/W 0003h 0004h 0005h Port B PBDR PBDDR PBOR Port B Data Register Port B Data Direction Register Port B Option Register 00h(1) 00h 00h R/W R/W R/W 0006h 0007h 0008h Port C PCDR PCDDR PCOR Port C Data Register Port C Data Direction Register Port C Option Register 00h(1) 00h 00h R/W R/W R/W 0009h 000Ah 000Bh Port D PDDR PDDDR PDOR Port D Data Register Port D Data Direction Register Port D Option Register 00h(1) 00h 00h R/W R/W R/W |
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