Stop Condition Generation - Philips CEM2100/00 Service Manual

16. Serial Bus Interface(I2C Bus) Ver.-D (SBI)
16.6 Data Transfer of I2C Bus
and the AD0 (Bit1 in the SBISRB) and implements processes according to conditions listed in " Table 16-
4 Operation in the Slave Mode ".
Table 16-4 Operation in the Slave Mode
TRX
1
0
Note: In the slave mode, if the slave address set in I2CAR is "00H", a START Byte "01H" in I
device detects slave address match and the TRX is set to "1".

16.6.4 Stop condition generation

When the BB is "1", a sequence of generating a stop condition is started by setting "1" to the MST, TRX and
PIN, and clear "0" to the BB. Do not modify the contents of the MST, TRX, BB, PIN until a stop condition is
generated on a bus.
When a SCL line on a bus is pulled-down by other devices, a serial bus interface circuit generates a stop con-
dition after they release a SCL line.
The time from the releasing SCL line until the generating the STOP condition takes t
Check the AL (Bit3 in the SBISRB), the TRX (Bit6 in the SBISRB), the AAS (Bit2 in the SBISRB),
AL AAS AD0
A serial bus interface circuit loses arbitra-
tion when transmitting a slave address.
1 1 0 And receives a slave address of which the
value of the direction bit sent from another
master is "1".
In the slave receiver mode, a serial bus
interface circuit receives a slave address
1 0
of which the value of the direction bit sent
from the master is "1".
0
In the slave transmitter mode, 1-word data
0 0
is transmitted.
A serial bus interface circuit loses arbitra-
tion when transmitting a slave address.
And receives a slave address of which the
1 1/0
value of the direction bit sent from another
master is "0" or receives a "GENERAL
1
CALL".
A serial bus interface circuit loses arbitra-
tion when transmitting a slave address or
0 0
data. And terminates transferring word
data.
In the slave receiver mode, a serial bus
interface circuit receives a slave address
1 1/0 of which the value of the direction bit sent
from the master is "0" or receives "GEN-
0
ERAL CALL".
In the slave receiver mode, a serial bus
0 1/0 interface circuit terminates receiving of 1-
word data.
Conditions
Set the number of bits in 1 word to the BC
and write transmitted data to the SBIDBR.
Test the LRB. If the LRB is set to "1", set
the PIN to "1" since the receiver does not
request next data. Then, clear the TRX to
"0" to release the bus. If the LRB is set to
"0", set the number of bits in 1 word to the
BC and write transmitted data to the
SBIDBR since the receiver requests next
data.
Read the SBIDBR for setting the PIN to
"1" (Reading dummy data) or write "1" to
the PIN.
A serial bus interface circuit is changed to
slave mode. To clear AL to "0", read the
SBIDBR or write the data to SBIDBR.
Read the SBIDBR for setting the PIN to
"1" (Reading dummy data) or write "1" to
the PIN.
Set the number of bits in 1-word to the BC
and read received data from the SBIDBR.
Page 208
T5CL8
Process
2
C bus standard is recived, the
.
LOW