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 22
Development
Production S. Schreiber 2007-08-24
The master can abort the procedure before an Easywave telegram is learned by setting the RX_MODE
register to any value unequal to the LN_RQ or LN_PL value.
Delete Learned Easywave Telegrams
The RX_MODE register must be set to the DELLN value. The / REQ output is always inactive (high).
When the DELLN value is written into RX_MODE register, the transceiver module immediately deletes the
learned Easywave telegram of the channel which is specified by the RX_CHANNEL register.
The transceiver module clears the appropriate bit in the bit mask of the RX_LN_CH0_7, RX_LN_CH8_15,
RX_LN_CH16_23, and RX_LN_CH24_31 registers to indicate that the channel is no longer used. If the
channel was not used before, the entire procedure described in this paragraph has not any effect.
A master should perfom the following steps if it wants to delete a learned Easywave telegram:
• Set the RX_MODE register to the PWD or PWD_RST value. This prevents the transceiver module from
modifying the RX_CHANNEL register.
• Set the RX_CHANNEL register appropriately. The master can determine an used channel by reading the bit
mask from the RX_LN_CH0_7, RX_LN_CH8_15, RX_LN_CH16_23, and RX_LN_CH24_31 registers.
• Set the RX_MODE register to the DELLN value.
Transmitting of Easywave Telegrams
The transceiver module has 32 built-in Easywave telegrams which it can transmit.
A write access to the TX_ACK register initiates transmitting of an Easywave telegram with the channel of the
TX_CHANNEL register and the button number of the TX_BUTTON register. The TX_ACK register also can be
written in a single write transfer with the other mentioned registers. The transceiver module does the
following:
• The transceiver module switches its transceiver on and transmits a fixed count of Easywave telegrams
regardless of the content of the RX_MODE register. The / REQ output and the status bits in the RX_STATUS
register remain on their state. As long as the transceiver transmits, the TX_TRANSMIT-bit in the
TX_STATUS register is 1. While the transceiver transmits, further writes into the TX_ACK register have not
any effect. The master has to check the TX_TRANSMIT-bit in the TX_STATUS register whether it can
initiate a desired transmission of a further Easywave telegram.
• When the transceiver has finished transmitting of telegrams, it switches its transceiver on (receive) or off
according to the RX_MODE register and continues operation as specified by the RX_MODE register. The
TX_TRANSMIT-bit in the TX_STATUS register is 0 now.
The yellow LED lights as long as the transceiver transmits. (The LED is drawn on Figure 1 on page 4).
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