SH7785 Datasheet, PDF (397/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

11. Local Bus State Controller (LBSC)
11.4.2 Bus Control Register (BCR)
BCR is a 32-bit readable/writable register that specifies the function, bus cycle state, etc for each
area. BCR is initialized to H'0000 0000 in big endian mode and to H'8000 0000 in little endian
mode by a power-on reset, however, not initialized by a manual reset.
BIt: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
END MAS
IAN TER
—
—
— DPUP — OPUP
DACKBST[3:0]
—
—
BREQ DMA
EN BST
Initial value: x* x* 0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R R R R R R/W R R/W R/W R/W R/W R/W R R R/W R/W
BIt: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
—
HIZ
CNT
—
—
—
—
—
—
—
ASYNC[6:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R R/W R R R R R R R R/W R/W R/W R/W R/W R/W R/W
Note: * The initial values of bits 31 and 30 depend on the states of the external pins MODE8 and MODE9, respectively.
Initial
Bit
Bit Name Value
31
ENDIAN x
30
MASTER x
29 to 27 ⎯
All 0
R/W Description
R
Endian Flag
The value on the external pin (MODE8) that sets the
endian mode is sampled and reflected in this bit at a
power-on reset by the PRESET pin. This bit determines
the endian for all spaces.
0: Indicates that a low level is on the MODE8 pin at a
power-on reset and the LSI has been configured for
big endian.
1: Indicates that a high level is on the MODE8 pin at a
power-on reset and the LSI has been configured for
little endian.
R
Master/Slave Flag
The value on the external pin (MODE9) that sets
master/slave is sampled and reflected in this bit at a
power-on reset by the PRESET pin. This bit specifies
master/slave for all spaces.
0: Indicates that a high level is on the MODE9 and the
LSI has been configured as master.
1: Indicates that a high level is on the MODE9 and the
LSI has been configured as slave.
R
Reserved
These bits are always read as 0. The write value should
always be 0.
Rev.1.00 Jan. 10, 2008 Page 367 of 1658
REJ09B0261-0100