523
BCR—Bus Control Register
H'FECC
Bus Controller
Bit
Initial value
Read/Write
15
BRLE
0
R/W
14
BREQOE
0
R/W
13
—
0
R/W
12
IDLC
1
R/W
11
ICIS1
1
R/W
10
ICIS0
1
R/W
9
WDBE
0
R/W
8
WAITE
0
R/W
Bit
Initial value
Read/Write
7
—
0
R/W
6
—
0
R/W
5
—
0
R/W
4
—
0
R/W
3
—
0
R/W
2
—
0
R/W
1
—
0
R/W
0
—
0
R/W
WAIT
Pin Enable
0
Wait input by
WAIT
pin disabled
WAIT
pin can be used as I/O port
1
Wait input by
WAIT
pin enabled
Write Data Buffer Enable
0
Write data buffer function not used
1
Write data buffer function used
Idle Cycle Insert 0
0
Idle cycle not inserted when external read cycle and
external write cycle are performed consecutively
1
Idle cycle inserted when external read cycle and
external write cycle are performed consecutively
Idle Cycle Insert 1
0
Idle cycle not inserted in case of consecutive
external read cycles in different areas
1
Idle cycle inserted in case of consecutive
external read cycles in different areas
BREQO
Pin Enable
0
BREQO
signal output disabled
BREQO
pin can be used as I/O port
1
BREQO
signal output enabled
External Bus Release Enable
0
External bus release disabled
BREQ
,
BACK
, and
BREQO
pins can be used as I/O ports
1
External bus release enabled
Idle Cycle State Number Select
0
Idle cycle comprises 1 state
1
Idle cycle comprises 2 states
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