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TSC80251G1D-16IB Folha de dados(PDF) 9 Page - TEMIC Semiconductors

Nome de Peças TSC80251G1D-16IB
Descrição Electrónicos  Extended 8-bit Microcontroller with Serial Communication
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Fabricante Electrônico  TEMIC [TEMIC Semiconductors]
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TSC87251G1A
9
Rev. A
September 21, 1998
6.2. Data Memory
The TSC87251G1A implements 1 Kbyte of on–chip data RAM. Figure 5 shows the split of the internal and external
data memory spaces. This memory is mapped in the data space just over the 32 bytes of registers area (see TSC80251
Programmers’ Guide). Hence, the part of the on–chip RAM located from 20h to FFh is bit addressable. This on–chip
RAM is not accessible through the program/code memory space.
For faster computation with the on–chip EPROM code of the TSC87251G1A, its upper 8 Kbytes are also mapped in
the upper part of the region 00: if the On–Chip Code Memory Map configuration bit is cleared (EMAP# bit in
UCONFIG1 byte, see Figure 7). However, if EA# is tied to a low level, the TSC87251G1A derivative is running as
a ROMless product and the code is actually fetched in the corresponding external memory (i.e. the upper 8 Kbytes of
the lower 16 Kbytes of the segment FF:). If EMAP# bit is set, the on–chip EPROM is not accessible through the region
00:.
All the accesses to the portion of the data space with no on–chip memory mapped onto are redirected to the external
memory.
FF:3FFFh
FF:0000h
01:0000h
00:FFFFh
00:E000h
Data External
Memory Space
On–chip Memory
EPROM/OTPROM Code
FF:FFFFh
FF:4000h
00:0420h
FE:FFFFh
8 Kbytes
8 Kbytes
1 Kbyte
32 bytes reg.
EMAP#= 1
Data Segments
48 Kbytes
16 Kbytes
8 Kbytes
56 Kbytes
RAM Data
FE:0000h
01:FFFFh
64 Kbytes
64 Kbytes
EMAP#= 0
EA#= 1
00:DFFFh
FD:FFFFh
02:0000h
Reserved
EA#= 0
Figure 5. Data Memory Mapping
6.3. Special Function Registers
The Special Function Registers (SFRs) of the TSC87251G1A derivatives fall into the categories detailed in Table 3
to Table 11.
SFRs are placed in a reserved on–chip memory region S: which is not represented in the data memory mapping
(Figure 5). The relative addresses within S: of these SFRs are provided together with their reset values in Table 12.
They are upward compatible with the SFRs of the standard 80C51 and the Intel’s 80C251Sx family. In this table, the
C251 core registers are in italics and are described in the TSC80251 Programmer’s Guide. The other SFRs are described
in the TSC80251G1 Design Guide. All the SFRs are bit–addressable using the C251 instruction set.


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