PIC16F87XA
DS39582B-page 82
2003 Microchip Technology Inc.
REGISTER 9-4:
SSPCON1: MSSP CONTROL REGISTER 1 (I
2
C MODE) (ADDRESS 14h)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WCOL
SSPOV
SSPEN
CKP
SSPM3
SSPM2
SSPM1
SSPM0
bit 7
bit 0
bit 7
WCOL: Write Collision Detect bit
In Master Transmit mode:
1
= A write to the SSPBUF register was attempted while the I
2
C conditions were not valid for
a transmission to be started. (Must be cleared in software.)
0
= No collision
In Slave Transmit mode:
1
= The SSPBUF register is written while it is still transmitting the previous word. (Must be
cleared in software.)
0
= No collision
In Receive mode (Master or Slave modes):
This is a “don’t care” bit.
bit 6
SSPOV: Receive Overflow Indicator bit
In Receive mode:
1
= A byte is received while the SSPBUF register is still holding the previous byte. (Must be
cleared in software.)
0
= No overflow
In Transmit mode:
This is a “don’t care” bit in Transmit mode.
bit 5
SSPEN: Synchronous Serial Port Enable bit
1
= Enables the serial port and configures the SDA and SCL pins as the serial port pins
0
= Disables the serial port and configures these pins as I/O port pins
Note:
When enabled, the SDA and SCL pins must be properly configured as input or output.
bit 4
CKP: SCK Release Control bit
In Slave mode:
1
= Release clock
0
= Holds clock low (clock stretch). (Used to ensure data setup time.)
In Master mode:
Unused in this mode.
bit 3-0
SSPM3:SSPM0: Synchronous Serial Port Mode Select bits
1111
= I
2
C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
1110
= I
2
C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
1011
= I
2
C Firmware Controlled Master mode (Slave Idle)
1000
= I
2
C Master mode, clock = F
OSC
/(4 * ( 1))
0111
= I
2
C Slave mode, 10-bit address
0110
= I
2
C Slave mode, 7-bit address
Note:
Bit combinations not specifically listed here are either reserved or implemented in
SPI mode only.
Legend:
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
http://www.xinpian.net
提供单片机解密、IC解密、芯片解密业务
010-62245566 13810019655
