SN8F2280 Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
the next start bit, stop bit, or not ACK bit.
In slave mode:
0 = Write.
1 = Read.
In master mode:
0 = Transmit is not in progress.
1 = Transmit is in progress.
Or this bit with SEN, RSEN, PEN, RCEN, or ACKEN will indicate if the MSP is in IDLE mode.
Bit 0
BF: Buffer Full Status bit.
Receive:
1 = Receive complete, MSPBUF is full.
0 = Receive not complete, MSPBUF is empty.
Transmit:
1 = Data Transmit in progress (does not include the ACK and stop bits), MSPBUF is full.
0 = Data Transmit complete (does not include the ACK and stop bits), MSPBUF is empty.
13.3 MSP MODE REGISTER 1
MSPM1 initial value =000000x0
0EBH
MSPM1
Read/Write
After Reset
Bit 7
WCOL
R/W
0
Bit 6
MSPOV
R/W
Bit 5
MSPENB
R/W
Bit 4
CKP
R/W
0
Bit 3
SLRXCKP
R/W
Bit 2
MSPWK
R/W
Bit 1
Bit 0
MSPC
R/W
0
0
0
0
0
Bit 7
WCOL: Write Collision Detect bit.
Master Mode:
0 = No collision.
1 = A write to the MSPBUF register was attempted while the MSP conditions were not valid for a
transmission to be started.
Slave Mode:
0 = No collision.
1 = The MSPBUF register is written while it is still transmitting the previous word. (must be cleared in
software)
Bit 6
MSPOV: Receive Overflow Indicator bit.
0 = No overflow.
1 = A byte is received while the MSPBUF register is still holding the previous byte. MSPOV is a “don’t care”
in transmit mode. MSPOV must be cleared in software in either mode. (must be cleared in software)
Bit 5
Bit 4
MSPENB: Main Serial Port Communication Enable.
0 = Disables Main Serial Port and configures these pins as I/O port pins.
1 = Enables Main Serial Port and configures SCL and SDA as the source of the serial port pins.
CKP: SCL Clock Priority Control bit.
In MSP Slave mode:
0 = Hold SCL keeping Low. (Ensure data setup time and Slave device ready)
1 = Release SCL Clock.
(Slave Transistor mode CKP function always enables, Slave Receiver CKP function control by SLRXCKP)
In MSP Master mode:
Unused.
Bit 3
SLRXCKP: Slave Receiver mode SCL Clock Priority Control bit.
In MSP Slave Receiver mode:
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