Texas Instruments TMS320C3x - Manual (Page 71)

CPU Multiport Register File
3-8
Table 3–2. Status Register Bits (Continued)
Bit Name Description Name Reset Value
PRGW Dependent
on PRGW
pin level Program width status
(‘C32 only) Indicates the status of the external input PRGW pin.
When the signal of the PRGW pin is high, the PRGW
status bit is set to 1, indicating a 16-bit memory width.
The ‘C32 performs two fetches to retrieve a single 32-bit
instruction word. The PRGW bit is a read-only bit, and
can have the following values:
PRG
0
1
Effect
Instruction fetches use one 32-bit exter-
nal program memory read.
Instruction fetches use two 16-bit exter-
nal program memory reads.
Note: If a load of the status register occurs simultaneously with a CPU interrupt pulse trying to reset GIE, GIE is reset.