HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 135
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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8.2
8.2.1
The bus control register (BCR) is a 16-bit read/write register that selects the functions of areas and
status of bus cycles. It is initialized to H'0000 by a power-on reset, but is not initialized by a
manual reset or in standby mode.
Bit 15—DRAM Enable Bit (DRAME): DRAME selects whether area 1 is used as an external
memory space or DRAM space. 0 sets it as external memory space and 1 sets it as DRAM space.
The setting of the DRAM area control register is valid only when this bit is set to 1.
Bit 15: DRAME
0
1
Bit 14—Multiplexed I/O Enable Bit (IOE): IOE selects whether area 6 is used as external
memory space or an address/data multiplexed I/O area. 0 sets it as external memory space and 1
sets it as address/data multiplexed I/O space. With address/data multiplexed I/O space, the address
and data are multiplexed and input/output is from AD15–AD0.
Bit 14: IOE
0
1
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Register Descriptions
Bus Control Register (BCR)
Description
Area 1 is external memory space
Area 1 is DRAM space
Description
Area 6 is external memory space
Area 6 is an address/data multiplexed I/O area
DRAME
R/W
15
—
—
0
7
0
R/W
IOE
14
—
—
0
6
0
WARP
R/W
13
—
—
0
5
0
RDDTY
R/W
12
—
—
0
4
0
Rev. 7.00 Jan 31, 2006 page 109 of 658
Section 8 Bus State Controller (BSC)
BAS
R/W
11
—
—
0
3
0
10
—
—
—
—
0
2
0
REJ09B0272-0700
—
—
—
—
9
0
1
0
(Initial value)
(Initial value)
—
—
—
—
8
0
0
0
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