Texas Instruments TMS320C28 series Reference Manual page 15

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Register C28x
CPU
ACC Yes
AH Yes
AL Yes
XAR0 Yes
XAR1 Yes
XAR2 Yes
XAR3 Yes
XAR4 Yes
XAR5 Yes
XAR6 Yes
XAR7 Yes
AR0 Yes
AR1 Yes
AR2 Yes
AR3 Yes
AR4 Yes
AR5 Yes
AR6 Yes
AR7 Yes
DP Yes
IFR Yes
IER Yes
DBGIER Yes
P Yes
PH Yes
PL Yes
PC Yes
RPC Yes
SP Yes
ST0 Yes
ST1 Yes
XT Yes
T Yes
TL Yes
ROH No
R1H No
R2H No
R3H No
R4H No
R5H No
R6H No
R7H No
STF No
RB No
(1)
Reset value shown is for devices without the VMAP signal and MOM1MAP signal pinned out. On these devices both of these
signals are tied high internal to the device.
SPRUEO2A – June 2007 – Revised August 2008
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Table 2-1. 28x Plus Floating-Point CPU Register Summary
C28x+FPU Size
Yes 32 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 32 bits
Yes 16 bits
Yes 16 bits
Yes 22 bits
Yes 22 bits
Yes 16 bits
Yes 16 bits
Yes 16 bits
Yes 32 bits
Yes 16 bits
Yes 16 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Yes 32 bits
Description
Accumulator
High half of ACC
Low half of ACC
Auxiliary register 0
Auxiliary register 1
Auxiliary register 2
Auxiliary register 3
Auxiliary register 4
Auxiliary register 5
Auxiliary register 6
Auxiliary register 7
Low half of XAR0
Low half of XAR1
Low half of XAR2
Low half of XAR3
Low half of XAR4
Low half of XAR5
Low half of XAR6
Low half of XAR7
Data-page pointer
Interrupt flag register
Interrupt enable register
Debug interrupt enable register
Product register
High half of P
Low half of P
Program counter
Return program counter
Stack pointer
Status register 0
Status register 1
Multiplicand register
High half of XT
Low half of XT
Floating-point result register 0
Floating-point result register 1
Floating-point result register 2
Floating-point result register 3
Floating-point result register 4
Floating-point result register 5
Floating-point result register 6
Floating-point result register 7
Floating-point status register
Repeat block register
CPU Registers
Value After Reset
0x00000000
0x0000
0x0000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x0000
0x00000000
0x0000
0x0000
0x3FFFC0
0x00000000
0x0400
0x0000
(1)
0x080B
0x00000000
0x0000
0x0000
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0x00000000
0x00000000
CPU Register Set 15