參數資料
型號: M37641M8-100FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數: 62/149頁
文件大小: 1997K
代理商: M37641M8-100FP
62
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
[Data Bus Buffer Status Register 0, 1 (DBBS0, DBBS1)]
0049
16
, 004D
16
The data bus buffer status registers 0, 1 consist of eight bits each.
Bits 0, 1, and 3 are read-only bits and indicate the status of the
data bus buffer. Bits 2, 4, 5, 6, and 7 are user definable flags
which can be programed, and can be read/written. The host CPU
can only read this register when the A
0
pin is set to
H
.
Bit 0: Output buffer full flag OBF
0
, OBF
1
When writing data to the output data bus buffer, this flag is set to
1
. When reading the output data bus buffer from the host CPU,
this flag is cleared to
0
.
Bit 1: Input buffer full flag IBF
0
, IBF
1
When writing data from the host CPU to the input data bus
buffer, this flag is set to
1
. When reading the input data bus
buffer from the slave CPU side, this flag is are cleared to
0
.
Bit 3: A0 flag A
00
, A
01
When writing data from the host CPU to the input data bus
buffer, the level of the A
0
pin is latched.
[Input Data Bus Buffer Registers 0, 1 (DBBIN
0
, DBBIN
1
)]
0048
16
, 004C
16
Data on the data bus is latched to DBBIN
0
or DBBIN
1
by writing
request from the host CPU. Data of DBBINs can be read from the
Data Bus Buffer Registers (address 0048
16
or 004C
16
) on the
SFR area.
[Output Data Bus Buffer Registers 0, 1 (DBBOUT
0
,
DBBOUT
1
)] 0048
16
, 004C
16
When writing data to the Data Bus Buffer Registers (address
0048
16
or 004C
16
) on the SFR area, data is set to DBBOUT
0
or
DBBOUT
1
. Data of DBBOUTs is output onto the data bus by per-
forming the reading request from the host CPU when the A
0
pin is
set to
L
.
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