h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 166

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 5 Interrupt Controller
5.2.8
BAR consists of three 8-bit readable/writable registers (BARA, BARB, and BARC), and is used to
specify the address at which an address break is to be executed.
Each of the BAR registers is initialized to H'00 by a reset and in hardware standby mode. They are
not initialized in software standby mode.
BARA Bits 7 to 0—Address 23 to 16 (A23 to A16)
BARB Bits 7 to 0—Address 15 to 8 (A15 to A8)
BARC Bits 7 to 1—Address 7 to 1 (A7 to A1)
These bits specify the address at which an address break is to be executed. BAR bits A15 to A1
are compared with internal address bus lines A15 to A1, respectively.
The address at which the first instruction byte is located should be specified as the break address.
Occurrence of the address break condition may not be recognized for other addresses.
In normal mode, no comparison is made with address lines A23 to A16.
BARC Bit 0—Reserved: This bit cannot be modified and is always read as 0.
Rev. 4.00 Jun 06, 2006 page 112 of 1004
REJ09B0301-0400
Bit
BARA
Initial value
Read/Write
Bit
BARB
Initial value
Read/Write
Bit
BARC
Initial value
Read/Write
Break Address Registers A, B, C (BARA, BARB, BARC)
R/W
R/W
R/W
A23
A15
A7
7
0
7
0
7
0
R/W
R/W
R/W
A22
A14
A6
6
0
6
0
6
0
R/W
R/W
R/W
A21
A13
A5
5
0
5
0
5
0
R/W
R/W
R/W
A20
A12
A4
4
0
4
0
4
0
R/W
R/W
R/W
A19
A11
A3
3
0
3
0
3
0
R/W
R/W
R/W
A18
A10
A2
2
0
2
0
2
0
R/W
R/W
R/W
A17
A9
A1
1
0
1
0
1
0
R/W
R/W
A16
A8
—
—
0
0
0
0
0
0