HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 118

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

3.2.4
The DSP unit incorporates eight data registers (A0, A1, X0, X1, Y0, Y1, M0, and M1) and a status
register (DSR). Figure 3.3 shows the DSP register configuration. These are 32-bit width registers
with the exception of registers A0 and A1. Registers A0 and A1 include 8 guard bits (fields A0G
and A1G), giving them a total width of 40 bits. The DSR register stores the DSP data operation
result (zero, negative, others). The DSP register has a DC bit whose function is similar to the T bit
of the CPU register. For details on DSR bits, refer to section 3.5, DSP Data Operation Instructions.
Rev. 1.00, 02/04, page 80 of 804
DSP Registers
31
39
................ ................ ................
A0G
A1G
32 31
Figure 3.3 DSP Register Configuration
(a) DSP data registers
A0
A1
M0
M1
X0
X1
Y0
Y1
12
(b) DSP status register (DSR)
11
TS[2:0]
0
9
TC GT
8
Others: Undefined
7
DSR : All 0
Initial value
6
Z
N
5
4
V
3
CS[2:0]
1
DC
0