Encore electronic UM014605-0208 Serial Communications Devices, I2C Interface, LED Addressing

Z8 Encore!® Flash Microcontroller Development Kit

User Manual

Table 2. LED Cathode/Modem/Trigger

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Function/Port E Bit No	4	3	2	1	0
Cathode Column 0					X
Cathode Column 1				X
Cathode Column 2			X
Cathode Column 3		X
Cathode Column 4	X

Note: Column 0 = Leftmost Column

Table 3. LED Addressing

Function/Port, Bit No	PE[5]	PE[6]	PE[7]	PG[7]
D3	X
D4		X
D1			X
D2				X

Serial Communications Devices

I2C Interface

The Z8 Encore! is compatible with I2C protocol (in this case the PCA8550). The I2C controller consists of two bidirectional bus lines, a serial data (SDA) line and a serial clock (SCL) line.

The I2C Controller operates in Master mode to transmit and receive data.

Having a PCA8550 on board enables configuration of the Expansion Module. The PCA8550 is a 4-bit multiplexer that selects four bits of data either from a non-volatile register or from the input pins. In this case four input pins are left unconnected and only a non-volatile register is selected as a source of data. Only three bits are used. Currently this chip is not used by the software provided with the board, so you can use it to your

UM014605-0208 Z8 Encore!® Evaluation Board