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Section 11 User Break Controller (UBC)
Rev. 4.00 Sep. 14, 2005 Page 246 of 982
REJ09B0023-0400
11.2.4 Break Address Register B (BARB)
BARB is a 32-bit readable/writable register. BARB specifies the address used as a break condition
in channel B. Control bits CDB1, CDB0, XYE, and XYS in BBRB select one of the four address
buses for break condition B.
Bit Bit Name
Initial
Value R/W Description
31 to 0 BAB31 to
BAB0
All 0 R/W Break Address B
Store an address which specifies a break condition in
channel B.
If the I bus or L bus is selected in BBRB, an IAB or
LAB address is set in BAB31 to BAB0.
If the X memory is selected in BBRB, the values in
bits 15 to 1 in XAB are set in BAB31 to BAB17. In this
case, the values in BAB16 to BAB0 are arbitrary.
If the Y memory is selected in BBRB, the values in
bits 15 to 1 in YAB are set in BAB15 to BAB1. In this
case, the values in BAB31 to BAB16 are arbitrary.
Table 11.1 Specifying Break Address Register
Bus Selection in
BBRB BAB31 to BAB17 BAB16 BAB15 to BAB1 BAB0
L bus LAB31 to LAB0
I bus IAB31 to IAB0
X bus XAB15 to XAB1 Don't care Don't care Don't care
Y bus Don't care Don't care YAB15 to YAB1 Don't care