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W77E516 Datasheet(PDF) 9 Page - Winbond |
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W77E516 Datasheet(HTML) 9 Page - Winbond |
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9 / 85 page  Preliminary W77E516 Publication Release Date: August 16, 2002 - 9 - Revision A1 Data Memory The W77E516 can access up to 64Kbytes of external Data Memory. This memory region is accessed by the MOVX instructions. Unlike the 8051 derivatives, the W77E516 contains on-chip 1K bytes MOVX SRAM of Data Memory, which can only be accessed by MOVX instructions. These 1K bytes of SRAM are between address 0000H and 03FFH. Access to the on-chip MOVX SRAM is optional under software control. When enabled by software, any MOVX instruction that uses this area will go to the on-chip RAM. MOVX addresses greater than 03FFH automatically go to external memory through Port 0 and 2. When disabled, the 1KB memory area is transparent to the system memory map. Any MOVX directed to the space between 0000H and FFFFH goes to the expanded bus on Port 0 and 2. This is the default condition. In addition, the W77E516 has the standard 256 bytes of on-chip Scratchpad RAM. This can be accessed either by direct addressing or by indirect addressing. There are also some Special Function Registers (SFRs), which can only be accessed by direct addressing. Since the Scratchpad RAM is only 256 bytes, it can be used only when data contents are small. In the event that larger data contents are present, two selections can be used. One is on-chip MOVX SRAM, the other is the external Data Memory. The on-chip MOVX SRAM can only be accessed by a MOVX instruction, the same as that for external Data Memory. However, the on-chip RAM has the fastest access times. 0000h FFFFh 80h 7Fh 00h Indirect Addressing RAM Direct & Indirect Addressing RAM SFRs Direct Addressing FFh 64 K Bytes External Data Memory 1K Bytes On-chip SRAM 0000h 03FFh 64K Bytes On-chip Program Memory APROM 0FFFh 4K Bytes LDROM Figure 1. Memory Map |
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