M37640E8FP 데이터 시트보기 (PDF) - Mitsumi

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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MSB

7

DBBS17

DBBS16

DBBS15

DBBS14

DBBS13

DBBS12

DBBS11

DBBS10

LSB

0

Address: 004D16

Access: R/W

Reset: 0016

DBBS10

Output Buffer Full (OBF1) Flag (bit 0)

0 : Output buffer empty.

1 : Output buffer full.

DBBS11

Input Buffer Full (BF01) Flag (bit 1)

0 : Input buffer empty.

1 : Input buffer full.

DBBS12 User Definable (U2) Flag (bit 3)

DBBS13

DBBS14

A0(A01) Flag (bit 2)

Indicates the A0 status when IBF flag is set

User Definable (U4) Flag (bit 4)

DBBS15 User Definable (U5) Flag (bit 5)

DBBS16 User Definable (U6) Flag (bit 6)

DBBS17 User Definable (U7) Flag (bit 7)

Fig. 1.79. Data Bus Buffer Status Register 1 (DBBS1)

MSB

7

DBBC17

Reserved Reserved DBBC14

DBBC13

DBBC12

DBBC11

DBBC10

LSB

0

Address: 004E6

Access: R/W

Reset: 0016

DBBC10

DBBC11

OBF1 Output Selection Bit (bit 0)

0 : P74 pin is operated as GPIO

1 : P74 pin is operated as PBF1 output pin if DBBC17 = “1”

IBF1 Output Selection Bit (bit 1)

DBBC12

0 : P73 pin is operated as GPIO

1 : P73 pin is operated as IBF1 output pin if DBBC17= “1”

IBF1 Interrupt Selection Bit (bit 2)

0 : IBF1 interrupt is generated by both write-data (A0= “0”) and write-

command (A0 = “1”)

DBBC13

1 : IBF1 interrupt is generated by write-command (A0 = “1”)only

Output Buffer 1 Empty interrupt disable Bit (bit 3)

0 : Enabled

1: Disabled

DBBC14 Input Buffer 0 Full interrupt disable Bit (bit 4)

0 : Enabled

1: Disabled

DBBC15 Reserved (Read/Write “0”)

DBBC16 Reserved (Read/Write “0”)

DBBC17 Data Bus Buffer Function Selection Bit (bit 7)

0 : Single data bus buffer - P72 is used as BPIO

1 : Double data bus buffer - P72 is used as S1 input

Fig. 1.80. Data Bus Buffer Control Register 1 (DBBC1)

67

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