m37280eksp Mitsumi Electronics, Corp., m37280eksp Datasheet - Page 40

• Manufacturer Part Number: m37280eksp
• Description: Single-chip 8-bit Cmos Microcomputer With Closed Caption Decoder And On-screen Display Controller
• Manufacturer: Mitsumi Electronics, Corp.

(8) Bit 7: Communication Mode Specification Bit (master/slave
This bit is used for master/slave specification for data communica-
tion. When this bit is “0,” the slave is specified, so that a START
condition and a STOP condition generated by the master are received,
and data communication is performed in synchronization with the
clock generated by the master. When this bit is “1,” the master is
specified and a START condition and a STOP condition are gener-
ated, and also the clocks required for data communication are gen-
erated on the SCL.
The MST bit is cleared to “0” in one of the following conditions.
• Immediately after completion of 1-byte data transmission when
• When a STOP condition is detected.
• When occurence of a START condition is disabled by the START
• At reset
Fig. 12.6.7 I
Fig. 12.6.8 Interrupt Request Signal Generation Timing
40
arbitration lost is detected
condition duplication preventing function (Note).
specification bit: MST)
2
C Status Register
I
2
C Status Register
b7 b6 b5 b4 b3 b2 b1 b0
IICIRQ
SCL
PIN
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
6, 7
Note : These bits and flags can be read out, but cannnot be written.
B
0
1
2
3
4
5
I
2
C status register (S1) [Address 00F8
Last receive bit (LRB)
(See note)
General call detecting flag
(AD0) (See note)
Slave address comparison
flag (AAS) (See note)
Arbitration lost detecting flag
(AL) (See note)
I
request bit (PIN)
Bus busy flag (BB)
Communication mode
specification bits
2
(TRX, MST)
C-BUS interface interrupt
M37280MF–XXXSP, M37280MK–XXXSP
Name
Note: The START condition duplication prevention function disables the START
0 : Last bit = “0 ”
1 : Last bit = “1 ”
0 : No general call detected
1 : General call detected
0 : Address match
1 : Address mismatch
0 : Not detected
1 : Detected
0 : Interrupt request issued
1 : No interrupt request issued
0 : Bus free
1 : Bus busy
b7 b6
0
0
1
1
condition generation, reset of bit counter reset, and SCL output, when
the following condition is satisfied:
a START condition is set by another master device.
0 : Slave recieve mode
1 : Slave transmit mode
0 : Master recieve mode
1 : Master transmit mode
Functions
16
and ON-SCREEN DISPLAY CONTROLLER
]
MITSUBISHI MICROCOMPUTERS
(See note)
(See note)
(See note)
(See note)
Indeterminate
After reset R W
M37280EKSP
0
0
0
0
0
0
R —
R —
R —
R —
R W
R W
R W
Rev. 1.0