(3) Event List: Displays the decoded data, corresponding line number, time and error information of the data line in a tabular
form for easily observe the longer decoded data.
(4) Pseudo Square Wave: Select on and the bus shows a square wave with logic 1 for high level and logic 0 for low level.
(5) Vertical Position: Adjust the Multipurpose knob to change the bus display position.
(6) Data Packet: After the device is paused, user can view the decoded data packets.
Trigger Setting:
Please refer to the Trigger Setting in the Edge Trigger section for more details.
6.2 I2C Decode
I2C protocol is usually used to connect a microcontroller and its peripheral equipment, and it is widely used in the field of
microelectronics communication control. The bus protocol uses two lines to transmit. One is serial data line SDA, the other
is serial clock line. The host-slave mechanism is adopted, which is a 2-way communication between host and slave. The
bus is multi-host which prevents data destruction through collision detection and arbitration mechanism. It's remarkable
that I2C bus has two kinds of address width: 7 bits and 10 bits. The two are compatible and can be combined. Both SCL
and SDA are connected to power through pull-up resistors. When the bus is vacant, the two lines are at high level. When
any component of bus outputs low level, the bus signals will become low. That is to say, the signals of multi-components
are wired AND logic. The special logic relationship is the key point to realize bus arbitration. The protocol requires that data
SDA should keep stable when clock line SCL is high. Normally, the data is transmitted by MSB format, as shown below:
I2C
Selection
:
Press
DECODE
type , and select I2C by the Multipurpose knob. You can also switch the trigger type by consecutively
pressing the type key, then press the Multipurpose knob to confirm.
SCL Source:
Press the SCL source button to select the SCL source, you can set any of CH1~CH4 as the clock input of I2C.
SDA source:
Press the SDA source button to select the SDA source, you can set any of CH1~CH4 as the data input of I2C.
Address Mode:
Press the address key to select the address mode and set the address bit width of I2C signal that needs to be triggered,
you can select 7bits or 10bits.
Operation Direction:
Press PgDn
operation direction to select write or read.
(1) Write: Triggers when the “read/write” bit of the I2C protocol is “write”.
(2) Read: Triggers when the “read/write” bit of the I2C protocol is “read”.
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Summary of Contents for UPO2000E Series
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