Lucent Technologies MN102F75K Manuale Utente

138

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.

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