M38861EDFS View Datasheet(PDF) - MITSUBISHI ELECTRIC
Part Name
Description
MFG CO.
M38861EDFS Datasheet PDF : 110 Pages
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MITSUBISHI MICROCOMPUTERS
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b7
b0
Data bus buffer control register
(DBBCON : address 002A16)
Data bus buffer enable bit
0 : P50–P53, P8 I/O port
1 : Data bus buffer enabled
Data bus buffer function selection bit
0 : Single data bus buffer mode (P47 functions as I/O port.)
1 : Double data bus buffer mode (P47 functions S1 input.)
OBF0 output selection bit
0 : OBF00 valid
1 : OBF01 valid
OBF00 output enable bit
0 : P42 functions as port I/O pin.
1 : P42 functions as OBF00 output pin.
OBF01 output enable bit
0 : P43 functions as port I/O pin.
1 : P43 functions as OBF01 output pin.
OBF10 output enable bit
0 : P46 functions as port I/O pin.
1 : P46 functions as OBF10 output pin.
Input level selection bit
0 : CMOS level input
1 : TTL level input
Reserved
Do not write “1” to this bit.
b7
b0
Data bus buffer status register 0
(DBBSTS0 : address 002916)
Output buffer full flag 0 (OBF0)
0 : Buffer empty
1 : Buffer full
Input buffer full flag 0 (IBF0)
0 : Buffer empty
1 : Buffer full
User definable flag (U02)
This flag can be defined by user freely.
A00 flag (A00)
This flag indicates the condition of A00 status
when the IBF0 flag is set.
User definable flag (U04–U07)
This flag can be defined by user freely.
b7
b0
Data bus buffer status register 1
(DBBSTS1 : address 002C16)
Output buffer full flag 1 (OBF1)
0 : Buffer empty
1 : Buffer full
Input buffer full flag 1 (IBF1)
0 : Buffer empty
1 : Buffer full
User definable flag (U12)
This flag can be defined by user freely.
A01 flag (A01)
This flag indicates the condition of A01 status
when the IBF1 flag is set.
User definable flag (U14–U17)
This flag can be defined by user freely.
Fig. 33 Structure of bus interface related register
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