Microchip Technology MA180025 データシート
2010 Microchip Technology Inc.
DS39933D-page 221
PIC18F87J90 FAMILY
REGISTER 18-3:
SSPSTAT: MSSP STATUS REGISTER (I
2
C™ MODE)
R/W-0
R/W-0
R-0
R-0
R-0
R-0
R-0
R-0
SMP
CKE
D/A
P
(1)
S
(1)
R/W
UA
BF
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
SMP: Slew Rate Control bit
In Master or Slave mode:
1
In Master or Slave mode:
1
= Slew rate control disabled for Standard Speed mode (100 kHz and 1 MHz)
0
= Slew rate control enabled for High-Speed mode (400 kHz)
bit 6
CKE: SMBus Select bit
In Master or Slave mode:
1
In Master or Slave mode:
1
= Enable SMBus specific inputs
0
= Disable SMBus specific inputs
bit 5
D/A: Data/Address bit
In Master mode:
Reserved.
In Slave mode:
1
In Master mode:
Reserved.
In Slave mode:
1
= Indicates that the last byte received or transmitted was data
0
= Indicates that the last byte received or transmitted was address
bit 4
P: Stop bit
(1)
1
= Indicates that a Stop bit has been detected last
0
= Stop bit was not detected last
bit 3
S: Start bit
(1)
1
= Indicates that a Start bit has been detected last
0
= Start bit was not detected last
bit 2
R/W: Read/Write Information bit (I
2
C™ mode only)
In Slave mode:
(2)
1
= Read
0
= Write
In Master mode:
(3)
1
= Transmit is in progress
0
= Transmit is not in progress
bit 1
UA: Update Address bit (10-Bit Slave mode only)
1
= Indicates that the user needs to update the address in the SSPADD register
0
= Address does not need to be updated
bit 0
BF: Buffer Full Status bit
In Transmit mode:
1
In Transmit mode:
1
= SSPBUF is full
0
= SSPBUF is empty
In Receive mode:
1
1
= SSPBUF is full (does not include the ACK and Stop bits)
0
= SSPBUF is empty (does not include the ACK and Stop bits)
Note 1:
This bit is cleared on Reset and when SSPEN is cleared.
2:
This bit holds the R/W bit information following the last address match. This bit is only valid from the
address match to the next Start bit, Stop bit or not ACK bit.
address match to the next Start bit, Stop bit or not ACK bit.
3:
ORing this bit with SEN, RSEN, PEN, RCEN or ACKEN will indicate if the MSSP is in Active mode.