SW00ENB-ZCC Toshiba, SW00ENB-ZCC Datasheet - Page 259

• Manufacturer Part Number: SW00ENB-ZCC
• Description: MCU, MPU & DSP Development Tools CASEWORKS
• Manufacturer: Toshiba

Specifications of SW00ENB-ZCC

• Tool Type: Development Software Support
• Core Architecture: 870
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.6.5
SCL Bus Line
Repeated START Condition
communicate on the bus, it can generate a repeated START condition and address another slave or
change the data direction without first generating a STOP condition. The following describes the steps
required to generate a repeated START condition.
release the bus. This causes the SDA pin to be held high and the SCL pin to be released. Because no
STOP condition is generated on the bus, other devices think that the bus is busy.
LRB bit until it is set to ensure that no other device is pulling the SCL bus line low. Once the bus is
determined to be free this way, use the steps described in Section 14.6.2 to generate a START
condition.
period must be created by software after the bus becomes free.
A data transfer is always terminated by a STOP condition. However, if a master still wishes to
First, clear the MST, TRX and BB bits in the SBI0CR2 and set the PIN bit in the same register to
Then, poll the SBI0SR.BB bit until it is cleared to ensure that the SCL pin is released. Next, poll the
To satisfy the minimum setup time of the START condition, in Standard-mode, at least 4.7- s wait
SDA Pin
SCL Pin
LRB Bit
PIN Bit
BB Bit
X = Don’t care
SBI0CR2
if SBI0SR<BB>
Then
if SBI0SR<LRB>
Then
4.7- s Wait
SBI0CR1
SBI0DBR
SBI0CR2
7 6 5 4 3 2 1 0
0 0 0 1 1 0 0 0
X X X 1 0 X X X
X X X X X X X X
1 1 1 1 1 0 0 0
Figure 14.18 Repeated START Condition
0
1
9
0
0
0
1
MST
TRX
BB
PIN
TMP1940CYAF-217
Release the bus.
Check that the SCL pin is released.
Check that no other device is pulling the SCL line low.
Select Acknowledge mode.
Load a slave address and the direction bit.
Generate a START condition.
4.7 s (min)
1
1
1
1
MST
TRX
BB
PIN
TMP1940CYAF
START Condition