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 19
Development
Production S. Schreiber 2007-08-24
Register
Address
Register Name Description of Register
0x23 RX_LN_CH24_31 Just as the RX_LN_CH0_7 register, but for channels 24 to 31.
Initialization on Reset
7007
• Bit 0: Channel 24 (channel number of the RX_CHANNEL register);
• Bit 1: Channel 25 (channel number of the RX_CHANNEL register);
• Bit 2: Channel 26 (channel number of the RX_CHANNEL register);
• Bit 3: Channel 27 (channel number of the RX_CHANNEL register);
• Bit 4: Channel 28 (channel number of the RX_CHANNEL register);
• Bit 5: Channel 29 (channel number of the RX_CHANNEL register);
• Bit 6: Channel 30 (channel number of the RX_CHANNEL register);
• Bit 7: Channel 31 (channel number of the RX_CHANNEL register)
After a reset the transceiver module is in power down state, and the transceiver is switched off.
The / REQ output is low.
The RX_MODE register is set to the PWD_RST value.
The I 2 C master can set the RX_MODE register to the PWD value; the / REQ output goes high then.
The PWD_RST mode is intended to recognize an occurred reset (due to a malfunction or a power fail) by the
asserted / REQ output.
Receiving of Easywave Telegrams
The RX_MODE register must be set to the RX_RQ value or the RX_PL value (Recevive Mode). If the RX_MODE
register is RX_PL, the / REQ output is always inactive (high). If the RX_MODE register is set to RX_RQ, the
/ REQ output works as described in the next paragraphs.
The transceiver module maintains learned telegrams. Each learned telegram is associated with a channel.
There are 32 channels. A channel can store one learned Easywave telegram (the channel is used) or a
channel stores not any learned Easywave telegram (the channel is unused).
There is a bit mask in the RX_LN_CH0_7, RX_LN_CH8_15, RX_LN_CH16_23, and RX_LN_CH24_31
registers which indicates usage of each channel (a channel is used or unused).
The transceiver module ignores a received Easywave telegram if it isn't equal to any of the learned Easywave
telegrams.
The / REQ output is high at first, the RX_TEL_CHANGED-bit in the RX_STATUS register is 0 (Figure 11).
The module switches on its transceiver and tries receiving some Easywave telegrams. When the module
receives an Easywave telegram, it does the following (Figure 11):
• The / REQ output goes low, and the RX_TEL_CHANGED-bit in the RX_STATUS register is set to 1 upon one
of the following conditions:
• The module has started receiving an Easywave telegram which is a learned one (after a pause or
after a preceding Easywave telegram). The RX_TEL_VALID-bit in the RX_STATUS register is set
to 1; it indicates the begin of a new Easywave telegram. (For example the user has pushed a
button of a transmitter.) The RX_CHANNEL register and the RX_BUTTON register contain the
channel number (of the learned Easywave telegram) and the button number. The RX_USERDATA0