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ST10F273E Datasheet(PDF) 22 Page - STMicroelectronics |
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ST10F273E Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 179 page  Memory organization ST10F273E 22/179 4 Memory organization The memory space of the ST10F273E is configured in a unified memory architecture. Code memory, data memory, registers and I/O ports are organized within the same linear address space of 16 Mbytes. The entire memory space can be accessed Byte wise or Word wise. Particular portions of the on-chip memory have additionally been made directly bit addressable. IFlash: 512 Kbytes of on-chip Flash memory. It is divided in 10 blocks (B0F0...B0F9) of the Bank 0 and two blocks of Bank 1 (B1F0, B1F1): read-while-write operations inside the same Bank are not allowed. When Bootstrap mode is selected, the Test-Flash Block B0TF (8 Kbyte) appears at address 00’0000h: refer to Chapter 5: Internal Flash memory on page 25 for more details on memory mapping in boot mode. The summary of address range for IFlash is the following: IRAM: 2 Kbytes of on-chip internal RAM (dual-port) is provided as a storage for data, system stack, general purpose register banks and code. A register bank is 16 Wordwide (R0 to R15) and / or Bytewide (RL0, RH0, …, RL7, RH7) general purpose registers group. XRAM: 32 K + 2 Kbytes of on-chip extension RAM (single port XRAM) is provided as a storage for data, user stack and code. The XRAM is divided into two areas, the first 2 Kbytes named XRAM1 and the second 32 Kbytes named XRAM2, connected to the internal XBUS and are accessed like an external memory in 16-bit demultiplexed bus-mode without wait state or read/write delay (31.25ns access at 64 MHz CPU clock). Byte and Word accesses are allowed. The XRAM1 address range is 00’E000h - 00’E7FFh if XPEN (bit 2 of SYSCON register), and XRAM1EN (bit 2 of XPERCON register) are set. If XRAM1EN or XPEN is cleared, then any access in the address range 00’E000h - 00’E7FFh will be directed to external memory Table 2. Summary of IFlash address range Blocks User mode Size B0TF Not visible 8 K B0F0 00’0000h - 00’1FFFh 8 K B0F1 00’2000h - 00’3FFFh 8 K B0F2 00’4000h - 00’5FFFh 8 K B0F3 00’6000h - 00’7FFFh 8 K B0F4 01’8000h - 01’FFFFh 32K B0F5 02’0000h - 02’FFFFh 64K B0F6 03’0000h - 03’FFFFh 64K B0F7 04’0000h - 04’FFFFh 64K B0F8 05’0000h - 05’FFFFh 64K B0F9 06’0000h - 06’FFFFh 64K B1F0 07’0000h - 07’FFFFh 64K B1F1 08’0000h - 08’FFFFh 64K |
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