參數(shù)資料
型號(hào)： M38867M8A-A07HP
廠商： Mitsubishi Electric Corporation
英文描述： connectors
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 38/110頁(yè)
文件大小： 1601K
代理商： M38867M8A-A07HP
38
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
[Data Bus Buffer Status Register 0, 1
(DBBSTS0, DBBSTS1)] 0029
16
, 002C
16
The data bus buffer status register 0, 1 consist of eight bits.
Bits 0, 1, and 3 are read-only bits and indicate the condition of the
data bus buffer. Bits 2, 4, 5, 6, and 7 are user definable flags
which can be set by program, and can be read/written. This regis-
ter can be read from the host CPU when the A
0
pin is set to “H”
only.
Bit 0: Output buffer full flag OBF
0
, OBF
1
When writing data to the output data bus buffer, these flags are
set to “1”. When reading the output data bus buffer from the host
CPU, these flags are 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, these flags are set to “1”. When reading the input data
bus buffer from the slave CPU side, these flags are cleared to
“0”.
Bit 3: A
0
flag A0
0
, A0
1
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 Register 0, 1 (DBBIN0,
DBBIN1)] 0028
16
, 002B
16
Data on the data bus is latched to DBBIN by writing request from
the host CPU. Data of DBBIN can be read from the data bus
buffer registers (address 0028
16
or 002B
16
) on SFR.
[Output Data Bus Buffer Register 0, 1
(DBBOUT0, DBBOUT1)] 0028
16
, 002B
16
When writing data to the data bus buffer registers (address 0028
16
or 002B
16
) on SFR, data is set to DBBOUT. Data of DBBOUT is
output from the host CPU to the data bus by performing the read-
ing request when the A
0
pin is set to “L”.
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