AS8218 datasheet(101/123 Pages) AMSCO

101 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 101 of 123

Transmission Protocol:

In order to make the data transfer easier for the system control a defined protocol is used for talking to the

UART1, where also the length of the data to be read from the XDATA address space is specified at the

beginning of the transmission. It looks like this:

Data

...

Read Command

(8 bits)

Start Address

(16 bits)

Block Length

(16 bits)

(TXD)

Note: When ‘enable_crc’ is set to 1 a 16-bit checksum word will be sent after the data stream. It can be used to

validate the received data.

Write to XDATA Address

For evaluation, but also for setting the RTC it will be required to write to a register located in the XDATA

address space (X_RAM and block interfaces). Also for this an SCT command is prepared. The following

diagram shows the main blocks involved and the data and signal flow:

UART1

SCT

RXD

SCT

registers

DSP

registers

RTC

registers

MPIO

registers

SPI

registers

X_RAM

LCDD

registers

Notes:

1) It is guaranteed that the MCU finishes its last (current) command before the XDATA access takes place.

2) In principle it is possible that a value, which has been modified using this write-command, immediately gets

overwritten by the MCU. Therefore this command has to be used in an intelligent way.

Transmission Protocol:

In order to make the data transfer easier for the system control a defined protocol is used for talking to the

UART1, where also the length of the data to be written to the XDATA address space is specified at the

beginning of the transmission. It looks like this:

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