Texas Instruments TMS320C3x - Manual (Page 235)

Power Management Modes
7-51 Program Flow Control
Figure 7–12. Interrupt Response Timing After IDLE2 Operation
1st address Vector address
Data
ADDR
INT0 Flag
INT3 to
INT0
INT3 to
H1
H3
Fetch first
instruction of
service routing
Interrupt vector
read
Clocks driven
CLKIN
7.9.2 LOPOWER
In the LOPOWER (low-power) mode, the CPU continues to execute instructions,
and the DMA can continue to perform transfers, but at a reduced clock rate of
CLKIN frequency divided by 16.
A ’C31 with a CLKIN frequency of 32 MHz performs identically to a 2 MHz ’C31
with an instruction cycle time of 1,000 ns.
During the read phase of the . . . The ’C31 and ’C32 . . .
LOPOWER instruction (Figure 7–13) Slow to 1/16 of full-speed operation.
MAXSPEED instruction (Figure 7–14) Resume full-speed operation.