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Section 11 User Break Controller (UBC)
Rev. 4.00 Sep. 14, 2005 Page 249 of 982
REJ09B0023-0400
11.2.8 Break Bus Cycle Register B (BBRB)
Break bus cycle register B (BBRB) is a 16-bit readable/writable register, which specifies (1) X bus
or Y bus, (2) L bus cycle or I bus cycle, (3) instruction fetch or data access, (4) read or write,
and (5) operand size in the break conditions of channel B.
Bit Bit Name
Initial
Value R/W Description
15 to 10 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.
9 XYE 0 R/W Selects the X memory bus or Y memory bus as the
channel B break condition. Note that this bit setting is
enabled only when the L bus is selected with the CDB1
and CDB0 bits. Selection between the X memory bus
and Y memory bus is done by the XYS bit.
0: Selects L bus for the channel B break condition
unconditionally
1: Selects X/Y memory bus for the channel B break
condition
8 XYS 0 R/W Selects the X bus or the Y bus as the bus of the
channel B break condition.
0: Selects the X bus for the channel B break condition
1: Selects the Y bus for the channel B break condition
7
6
CDB1
CDB0
0
0
R/W
R/W
L Bus Cycle/I Bus Cycle Select B
Select the L bus cycle or I bus cycle as the bus cycle
of the channel B break condition.
00: Condition comparison is not performed
01: The break condition is the L bus cycle
10: The break condition is the I bus cycle
11: The break condition is the L bus cycle