SH7211 Datasheet, PDF (172/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

Section 7 User Break Controller (UBC)
7.3.3 Break Bus Cycle Register_0 (BBR_0)
BBR_0 is a 16-bit readable/writable register, which specifies (1) disabling or enabling of user
break interrupts, (2) including or excluding of the data bus value, (3) bus master of the I bus, (4) C
bus cycle or I bus cycle, (5) instruction fetch or data access, (6) read or write, and (7) operand size
as the break conditions of channel 0. BBR_0 is initialized to H'0000 by a power-on reset, but
retains its previous value by a manual reset or in software standby mode or sleep mode.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
- UBID0 -
-
-
CP0[1:0]
CD0[1:0]
ID0[1:0]
RW0[1:0]
SZ0[1:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R R/W R
R
R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit
15, 14
Bit Name
⎯
13
UBID0
12 to 10 ⎯
9, 8
CP0[1:0]
Initial
Value
All 0
0
All 0
00
R/W Description
R
Reserved
These bits are always read as 0. The write value
should always be 0.
R/W User Break Interrupt Disable 0
Disables or enables user break interrupt requests
when a channel-0 break condition is satisfied.
0: User break interrupt requests enabled
1: User break interrupt requests disabled
R
Reserved
These bits are always read as 0. The write value
should always be 0.
R/W I-Bus Bus Master Select 0
Select the bus master when the bus cycle of the
channel-0 break condition is the I bus cycle. However,
when the C bus cycle is selected, this bit is invalidated
(only the CPU cycle).
x1: CPU cycle is included in break conditions
1x: DMAC cycle is included in break conditions
Rev. 2.00 May. 08, 2008 Page 148 of 1200
REJ09B0344-0200