Specification of RTRM08 Transceiver Module Easywave I2C - ELDAT

Specification
Index 1.01
Project No.
RF-Products, Controller RTRM08 Transceiver Module Easw I 2 C Page 14
Development
Production S. Schreiber 2007-08-24
After a reset the register address pointer is initialized with 0x00 (specifies the RX_MODE register, see below).
If the register address pointer points beyond the highest defined register address, behavior on read and write
attempts is undetermined.
The transceiver module is always able to process start conditions and I 2 C addresses on the I 2 C bus, even
though it processes any Easywave telegram internally. If the transceiver module is busy, it will slow down or
stop the transfer on the I 2 C-bus for short time intervals after it has been addressed by a master.
The transceiver module's registers are configured as follows:
Register
Address
Register Name Description of Register
0x00 RX_MODE Rx Mode register. The RX_MODE register controls the mode of the
transceiver module as long as it does not transmit an Easywave telegram.
7007
The RX_MODE register is a read-write register; a write specifies the desired
Rx mode of the module; a read supplies the current Rx mode of the
module.
The module enters the desired Rx mode immediately after the RX_MODE
register has been written.
One of the following values can be read or written:
• 0x00 (PWD_RST)
The module is in power down state after a reset. The module's
transceiver is switched off.
The / REQ output is asserted.
(Please refer to “Initialization on Reset“ on page 19.)
• 0x01 (PWD)
The module is in power down state. The module's transceiver is
switched off.
The / REQ output is not asserted.
(Please refer to “Initialization on Reset“ on page 19.)
• 0x02 (RX_RQ)
The module is in Receive Mode. When the module enters the Receive
Mode, it switches on its transceiver and tries receiving Easywave
telegrams.
The / REQ output indicates whether the module has received Easywave
telegrams, which can be read out via the I 2 C-bus subsequently.
The / REQ output also indicates whether Easywave telegrams are over.
When the module terminates the Receive Mode (because another
value than RX_RQ is written into the RX_MODE register), the module
switches its transceiver on or off according to the desired mode.
(Please refer to “Receiving of Easywave Telegrams“ on page 19.)
• 0x03 (RX_PL)
The module is in Receive Mode just as with the RX_RQ mode value, but
the / REQ output always remains inactive. Polling of the RX_STATUS
register is the only way of determining whether the module has
received Easywave telegrams, which can be read out via the I 2 C-bus.
When the module terminates the Receive Mode (because another
value than RX_PL is written into the RX_MODE register), the module
switches its transceiver on or off according to the desired mode.
(Please refer to “Receiving of Easywave Telegrams“ on page 19.)