PIC18F2480 MICROCHIP [Microchip Technology], PIC18F2480 Datasheet - Page 212

• Manufacturer Part Number: PIC18F2480
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2480/2580/4480/4580
17.4.5
The addressing procedure for the I
the first byte after the Start condition usually deter-
mines which device will be the slave addressed by the
master. The exception is the general call address which
can address all devices. When this address is used, all
devices
Acknowledge.
The general call address is one of eight addresses
reserved for specific purposes by the I
consists of all ‘0’s with R/W = 0.
The general call address is recognized when the
General
(SSPCON2<7> set). Following a Start bit detect, 8 bits
are shifted into the SSPSR and the address is com-
pared against the SSPADD. It is also compared to the
general call address and fixed in hardware.
FIGURE 17-15:
DS39637A-page 210
GCEN (SSPCON2<7>)
SSPOV (SSPCON1<6>)
SDA
SCL
SSPIF
BF (SSPSTAT<0>)
should,
Call
GENERAL CALL ADDRESS
SUPPORT
Enable
S
in
SLAVE MODE GENERAL CALL ADDRESS SEQUENCE
(7 OR 10-BIT ADDRESS MODE)
theory,
bit
1
(GCEN)
2
General Call Address
respond
2
C bus is such that
3
2
4
C protocol. It
is
with
5
enabled
6
Preliminary
an
7
R/W = 0
8
If the general call address matches, the SSPSR is
transferred to the SSPBUF, the BF flag bit is set (eighth
bit) and on the falling edge of the ninth bit (ACK bit), the
SSPIF interrupt flag bit is set.
When the interrupt is serviced, the source for the
interrupt can be checked by reading the contents of the
SSPBUF. The value can be used to determine if the
address was device specific or a general call address.
In 10-bit mode, the SSPADD is required to be updated
for the second half of the address to match and the UA
bit is set (SSPSTAT<1>). If the general call address is
sampled when the GCEN bit is set, while the slave is
configured in 10-bit Address mode, then the second
half of the address is not necessary, the UA bit will not
be set and the slave will begin receiving data after the
Acknowledge (Figure 17-15).
ACK
Address is compared to General Call Address
after ACK, set interrupt
9
D7
1
D6
2
Cleared in software
SSPBUF is read
Receiving Data
D5
3
D4
4
 2004 Microchip Technology Inc.
D3
5
D2
6
D1
7
D0
8
ACK
9
‘0’
‘1’