Specification of RTRM08 Transceiver Module Easywave I2C - ELDAT

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Specification Index 1.01 Project No. RF-Products, Controller RTRM08 Transceiver Module Easw I 2 C Page 20 Development Production S. Schreiber 2007-08-24 7007 and RX_USERDATA1 registers contain the opaque user data which is associated with the channel number. • The module does not receive further valid learned Easywave telegrams. The RX_TEL_VALID-bit in the RX_STATUS register is set to 0 now; it indicates the end of a learned Easywave telegram. (For example, the user has released the button of a transmitter.) • The I 2 C master can read out the channel number, the button number, and the opaque user data if the RX_TEL_VALID-bit in the RX_STATUS register is 1. While the RX_TEL_CHANGED bit is 1, the transceiver module won't change the contents of the RX_CHANNEL and RX_BUTTON registers and of the RX_TEL_VALID bit in the RX_STATUS register even if another Easywave telegram is received. • If the I 2 C master reads the RX_ACK register, the transceiver module drops the channel number and the button number of the received telegram. The RX_ACK register also can be read in a single read transfer with the other registers mentioned above. If one of the above conditions has occurred meanwhile, the / REQ output remains low, and the RX_TEL_CHANGED-bit in the RX_STATUS register remains 1. Otherwise the transceiver module clears the RX_TEL_CHANGED-bit in the RX_STATUS register and the / REQ output goes high. (For example, a user holds down the button of a transmitter or the user does not push any button.) If the / REQ output goes high, the transceiver module guarantees that it happens before the I 2 C read transfer from the RX_ACK register on the I 2 C-bus terminates. The green LED blinks as long as the transceiver module receives any Easywave telegram. (The LED is drawn on Figure 1 on page 4). transceiver /REQ output RX_TEL_- CHANGED RX_TEL_- VALID I 2 C-bus high low 1 0 1 0 RX on receive telegrams #1 read data: begin telegr. #1 RX on read data: end of telegr. Figure 11 Sequence when receiving Easywave telegrams receive telegrams #2 read data: begin telegr. #2 receive telegrams #3 read data: begin telegr. #3 RX on read data: end of telegr. A master should perfom the following steps if it wants to receive Easywave telegrams subsequent it has set the RX_MODE-register to the RX_RQ or RX_PL value: • Wait until the / REQ output goes low (RX_RQ only) or wait until the RX_TEL_CHANGED-bit in the
Specification Index 1.01 Project No. RF-Products, Controller RTRM08 Transceiver Module Easw I 2 C Page 21 Development Production S. Schreiber 2007-08-24 7007 RX_STATUS register is 1. Check the RX_MODE register. If the RX_MODE register is PWD_RST, set the RX_MODE register to RX_RQ or RX_PL again, and start with the first bullet. • Read the RX_TEL_VALID-bit in the RX_STATUS register, the channel number, the button number, and the opaque user data from the RX_CHANNEL, RX_BUTTON, RX_USERDATA0, and RX_USERDATA1 registers if necessary. • Read the RX_ACK register. • Start with the first step. Note that the current implementation interrupts any receive attempts of Easywave telegrams while the RX_USERDATA0 and RX_USERDATA1 registers are written. Learning of Easywave Telegrams The RX_MODE register must be set to the LN_RQ value or the LN_PL value (Learn Mode). If the RX_MODE register is LN_PL, the / REQ output is always inactive (high). If the RX_MODE register is set to LN_RQ, the / REQ output works as described in the next paragraphs. The Learn Mode works just as the receive mode except that the transceiver module does not modify the RX_CHANNEL register. The I 2 C master has to set this register appropriately and the transceiver module learns the first Easywave telegram which it receives after entering the Learn Mode. The transceiver module ignores any received Easywave telegram while being in Learn Mode if it is one which has been already learned before. After the transceiver module has learned an Easywave telegram, it ignores further received Easywave telegrams. The transceiver module sets 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 used now. If the channel has been used before, the Easywave telegram which has been learned before will be overwritten. The green LED blinks as long as the transceiver module receives any Easywave telegram. (The LED is drawn on Figure 1 on page 4). A master should perfom the following steps if it wants to learn an 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 unused 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. The master also can write some user data into the RX_USERDATA0 and RX_USERDATA1 registers. • Set the RX_MODE register to the LN_RQ or LN_PL value. • Wait until the / REQ output goes low (LN_RQ only) or wait until the RX_TEL_CHANGED-bit in the RX_STATUS register is 1. Check the RX_MODE register. If the RX_MODE register is PWD_RST, start with the first bullet. • Read the RX_TEL_VALID-bit in the RX_STATUS register, the channel number, the button number from the RX_CHANNEL and RX_BUTTON registers if necessary. • Read the RX_ACK register. • If the RX_TEL_VALID-bit in the RX_STATUS register was 1 above, the transceiver module has learned an Easywave telegram. If the RX_TEL_VALID-bit in the RX_STATUS register was 0, the master should continue waiting for an Easywave telegram (fourth bullet). • The master can write some user data into the RX_USERDATA0, and RX_USERDATA1 registers again if desired.
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Specification of RTRM08 Transceiver Module Easywave I2C - ELDAT

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