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W77L32 Datasheet(PDF) 9 Page - Winbond

Part # W77L32
Description  8-BIT MICROCONTROLLER
Download  74 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
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W77L32 Datasheet(HTML) 9 Page - Winbond

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Preliminary W77L32
Publication Release Date: November 2, 2001
- 9 -
Revision A1
Data Memory
The W77L32 can access up to 64Kbytes of external Data Memory. This memory region is accessed by
the MOVX instructions. Unlike the 8051 derivatives, the W77L32 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 W77L32 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
64 K
Bytes
External
Data
Memory
Indirect
Addressing
RAM
Direct &
Indirect
Addressing
RAM
SFRs
Direct
Addressing
only
FFh
FFFFh
0000h
64K bytes
of
External
Program
Memory
1K Bytes
On-chip SRAM
0000h
03FFh
Figure 1. Memory Map


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