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TSC80251

TSC 80251 Programmer’s Guide

Temic Semiconductors 

TSC80251

3.4.1. Byte, Word and Dword Registers

Depending on its location in the register file, a register is addressable as a byte, a word, or a dword, as shown in the

right side of Figure 3.5. A register is named for its lowest numbered byte location. For instance:

D R4 is the byte register consisting of location 4.

D WR4 is the word register consisting of registers 4 and 5.

D DR4 is the dword register consisting of registers 4, 5, 6, and 7.

Locations R0-R15 are addressable as bytes, words or dwords. Locations 16-31 are addressable only as words or dwords.

Locations 56-63 are addressable only as dwords. Registers are addressed only by the names shown in Figure 3.5. ,

except for the 32 registers that comprise the four banks of registers R0-R7, which can also be accessed as locations

00:0000h-00:001Fh in the memory space.

Byte Registers

Register File

56 57 58 59 60 61 62 63

Locations 32-55 are Reserved

24 25 26 27 28 29 30 31

16 17 18 19 20 21 22 23

8 9 10 11 12 13 14 15

01234567

Note :

R10 = B

R11 = A

R8 R9 R10 R11 R12 R13 R14 R15

R0 R1 R2 R3 R4 R5 R6 R7

Word Registers

WR24

WR16

WR8

WR0

WR26

WR18

WR10

WR2

WR28

WR20

WR12

WR4

WR30

WR22

WR14

WR6

Dword Registers

DR56 = DPX DR60 = SPX

01234567

Banks 0-3

DR24

DR16

DR8

DR0

DR28

DR20

DR12

DR4

Figure 3.5. Register File in Byte, Word, and Dword Register Views

Rev. C – May 7, 1999

3.5

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