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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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TUSB2136PM Arkusz danych(PDF) 13 Page - Texas Instruments |
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TUSB2136PM Arkusz danych(HTML) 13 Page - Texas Instruments |
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13 / 50 page  2–1 2 Functional Description 2.1 MCU Memory Map Figure 2–1 illustrates the MCU memory map under boot and normal operation. It must be noted that the internal 256 bytes of IDATA are not shown since it is assumed to be in the standard 8052 location (0000 to 00FF). The shaded areas represent the internal ROM/RAM. For more information regarding the integrated 8052, see the TUSBxxxx Microcontroller Reference Guide (SLLU044). When the SDW bit = 0 (boot mode): The 6K ROM is mapped to address (0000–17FF) and is duplicated in location (8000–97FF) in code space. The internal 8K RAM is mapped to address range (0000–1FFF) in data space. Buffers, memory-mapped registers (MMRs) and I/O are mapped to address range (FD80–FFFF) in data space. When the SDW bit = 1 (normal mode): The 6K ROM is mapped to (8000–97FF) in code space. The internal 8K RAM is mapped to address range (0000–1FFF) code space. Buffers, MMR and I/O are mapped to address range (FD80–FFFF) in data space. 0000 Boot Mode (SDW = 0) CODE 6K Boot ROM 17FF 1FFF 6K Boot ROM 97FF 8000 FD80 FFFF FF80 8K RAM Read/Write XDATA MMR 512 Bytes RAM 8K Code RAM Read Only CODE Normal Mode (SDW = 1) 6K Boot ROM XDATA MMR 512 Bytes RAM Figure 2–1. MCU Memory Map (TUSB2136B) 2.2 Miscellaneous Registers 2.2.1 TUSB2136 Boot Operation Because the code space is in RAM (with the exception of the boot ROM), the TUSB2136 firmware must be loaded from an external source. Two options for booting are available: an external serial EEPROM source connected to the |
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