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 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.)
Specification Index 1.01 Project No. RF-Products, Controller RTRM08 Transceiver Module Easw I 2 C Page 15 Development Production S. Schreiber 2007-08-24 Register Address Register Name Description of Register 7007 • 0x04 (LN_RQ) The module is in Learn Mode. When the module enters the Learn Mode, it switches on its transceiver and tries receiving Easywave telegrams. The module learns the first Easywave telegram which it receives. The / REQ output indicates whether the module has received and learned an Easywave telegram. When the module terminates the Learn Mode (because another value than LN_RQ is written into the RX_MODE register), the module switches its transceiver on or off according to the desired mode. (Please refer to “Learning of Easywave Telegrams“ on page 21.) • 0x05 (LN_PL) The module is in Learn Mode just as with the LN_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 and learned an Easywave telegram. When the module terminates the Learn Mode (because another value than LN_PL is written into the RX_MODE register), the module switches its transceiver on or off according to the desired mode. (Please refer to “Learning of Easywave Telegrams“ on page 21.) • 0x06 (DELLN) The module's transceiver is switched off. The module deletes a learned Easywave telegram. The / REQ output is not asserted. (Please refer to “Delete Learned Easywave Telegrams“ on page 22.) 0x01 RX_STATUS Rx Status register. This register indicates received and learned Easywave telegrams while being in Rx mode or Learn mode. The RX_STATUS register is a read-only register, a write to the register has not any effect. • Bit 7: (RX_TEL_CHANGED) The RX_TEL_CHANGED bit is set to 1 if the received Easywave telegram changes while being in Receive Mode: An Easywave telegram has received or an Easywave telegram has been received which differs from the preceding one or there is not any further valid Easywave telegram received. If the RX_TEL_CHANGED bit is set from 0 to 1, the transceiver module sets the RX_CHANNEL and RX_BUTTON registers, and the RX_TEL_VALID bit in this Rx Status register according to the received Easywave telegram. While the RX_TEL_CHANGED bit is 1, the RX_CHANNEL and RX_BUTTON registers and the RX_TEL_VALID bit in this Rx Status register won't change their contents even if another Easywave telegram is received. Reading the RX_ACK register clears the RX_TEL_CHANGED bit. (Please refer to “Receiving of Easywave Telegrams“ on page 19.)
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Specification of RTRM08 Transceiver Module Easywave I2C - ELDAT

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