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•
Press the SCLK EDGE button to set the clock source as rising edge or falling edge.
•
SDA: Select data source
Press this option key and the present clock source font becomes green. Press the
SDA button again to switch any channel among CH1-CH4 as clock source. The
logic level can be adjusted when the corresponding signal source is selected. The
way of adjusting is the same with that of trigger level. To avoid the effect of signal
noise, it is suggested that the comparative level should be set in the waveform
centre area to obtain the accurate captured result.
•
CONDITION: Trigger Condition Selection
•
Press this option button and the trigger timing selection will display. The following
are the trigger timing conditions:
1.
START: Trigger at the starting moment. Namely, SDA occurs at falling edge when
SCL is at logic high. Note that the restarting state is stored in I2C, the starting signal
can occur again (restart) before first signal's stop signal. Both the start and the
restart can produce a trigger signal.
2.
RESTART: Triggers at the restarting moment. When a start signal occurs before the
previous signal ends, this situation is defined as restart signal.
3.
STOP: Triggers when the stop bit occurs. Namely, SDA goes from low to high when
SCL is high.
4.
LOSS: It is the loss confirmation trigger. Every time after 8 bits are transmitted
in I2C protocol, the data receiver transmits the receiving signal, which is the
answering bit in figure above. The SDA signal is low and SCL high. The loss
confirmation trigger occurs on the receiving bit, when SCL and SDA and both high.
5.
ADDR: It is address trigger. The address trigger will occur if the communication
address is the same with the user setting address. It can help to quickly locate
using address.
6.
DATA: It is data trigger. The data trigger can occur with the following conditions:
equal/greater/less/unequal. It is convenient to analyse data and capture abnormal
data.
7.
ADDR DATA: It is address data trigger. The trigger occurs when the addresses
are the same during transmitting and the data satisfies the setting condition. It is
convenient to realize the I2C specified address trigger and data trigger, and help
analyse the transmission.
•
Press the NEXT PAGE function key to enter additional I2C trigger settings:
Address Setting
•
Press the ADDR button to set the related address information.
•
WIDTH: It is the address width selection. Press this option button and the address
width selection list pops up. Press the WIDTH function button again to select 7 or
10 bits width. Rotating the multi-purpose control can also select the width. Press
the multi-purpose control to confirm selection.
•
ADDRESS: Within this interface, directly rotate the multi-purpose control to set the
address value. Note that the set value is related to the present bit width. The seven
bit address can be set from 0x0 to 0x7F and the ten bit address can be set from
0x0 to 0x3FF.
•
DIRECTION: Set the read-write direction. Select this option and the read/write
selection list will pop up. Press the read/write option key to switch between each
other. After the selection list pops up, the multi-purpose control can also be used.
Press the multi-purpose control to confirm selection.
18
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