PIC16C63A/65B/73B/74B
a) The Buffer Full flag bit, BF(SSPSTAT<0>) was
set, indicating that the byte in SSPBUF was
waiting to be read when another byte was
received. This sets the SSPOV flag.
10.3.1.2
Reception
When the R/W bit of the address byte is clear and an
address match occurs, the R/W bit of the SSPSTAT
register is cleared. The received address is loaded into
the SSPBUF register.
b) The overflow flag, SSPOV (SSPCON1<6>) was
set.
When the address byte overflow condition exists, then
no acknowledge (ACK) pulse is given. An overflow con-
dition is defined as any situation where a received byte
in SSPBUF is overwritten by the next received byte
before it has been read. An overflow has occurred
when:
An SSP interrupt is generated for each data transfer
byte. Flag bit SSPIF (PIR1<3>) must be cleared in soft-
ware. The SSPSTAT register is used to determine the
status of the byte.
FIGURE 10-6:
I2C WAVEFORMS FOR RECEPTION (7-BIT ADDRESS)
Receiving Address
R/W=0
Receiving Data
Receiving Data
ACK
9
ACK
9
ACK
9
A7 A6 A5 A4
SDA
SCL
A3 A2 A1
D5
D2
D0
8
D5
D2
D0
8
D7 D6
D4 D3
D7 D6
D4 D3
D1
7
D1
7
3
7
1
2
4
5
4
3
6
5
6
1
2
3
6
1
2
4
8
5
P
S
SSPIF (PIR1<3>)
Cleared in software
Bus Master
terminates
transfer
BF (SSPSTAT<0>)
SSPBUF register is read
SSPOV (SSPCON<6>)
Bit SSPOV is set because the SSPBUF register is still full
ACK is not sent
DS30605C-page 62
2000 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
