Lucent Technologies MN10285K - Manual (Page 139)

Serial Interfaces
Serial Interface Setup Examples
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
138
Panasonic
Reception must be enabled for
the circuit to detect a stop
sequence.
2. When you perform step 1, the SBT0 output signal goes high. One cycle later,
the SBO0 output signal also goes high, signalling the stop sequence. The
SC0ISP flag of SC0STR becomes 1. The SC0IST and SC0ISP flags are both
cleared by a write to or read from the serial port 0 transmit/receive buffer.
Figure 5-13 shows an example timing chart.
Figure 5-13 Master Transmitter Timing in I
2
C Mode (with ACK)
b7 b6 b5 b4 b3 b2 b1 b0 b6 b5 b4 b3 b2 b1 b0 ACK b7 ACK
Tx interrupt request
Stop detection bit = 1 Start detection bit = 1
I 2 C sequence
output bit
Write to
SC0TRB
SBO0 output
SBT0 output
Data tx 1 Start sequence
Tx interrupt request
Data tx 2 Stop sequence