PIC16C65B Microchip Technology Inc., PIC16C65B Datasheet - Page 62

• Manufacturer Part Number: PIC16C65B
• Description: 8-bit Cmos Microcontrollers With A/d Converter
• Manufacturer: Microchip Technology Inc.

PIC16C63A/65B/73B/74B
10.3.1.2
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.
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:
FIGURE 10-6:
DS30605C-page 62
SDA
SCL
SSPIF (PIR1<3>)
BF (SSPSTAT<0>)
SSPOV (SSPCON<6>)
S
A7 A6 A5 A4 A3 A2 A1
1
Reception
2
Receiving Address
3
I
4
2
C WAVEFORMS FOR RECEPTION (7-BIT ADDRESS)
5
6
R/W=0
7
8
ACK
9
D7
1
D6
2
SSPBUF register is read
Receiving Data
D5
3
Cleared in software
D4
Bit SSPOV is set because the SSPBUF register is still full
4
D3
5
D2
6
a)
b)
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.
D1
7
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.
The overflow flag, SSPOV (SSPCON1<6>) was
set.
D0
8
ACK
9
D7
1
D6
2
D5
Receiving Data
3
D4
4
ACK is not sent
D3
2000 Microchip Technology Inc.
5
D2
6
D1
7
D0
8
ACK
9
Bus Master
transfer
terminates
P