Rainbow-electronics ATmega128RFA1 Instrukcja Użytkownika Pobierz pdf (Strona 169)

169

8266A-MCU Wireless-12/09

ATmega128RFA1

• Bit 2 – PRRAM2 - Power Reduction SRAM 2

Setting this bit to one will disable the SRAM block 2. Setting this bit to zero will enable

the SRAM block 2.

• Bit 1 – PRRAM1 - Power Reduction SRAM 1

Setting this bit to one will disable the SRAM block 1. Setting this bit to zero will enable

the SRAM block 1.

• Bit 0 – PRRAM0 - Power Reduction SRAM 0

Setting this bit to one will disable the SRAM block 0. Setting this bit to zero will enable

the SRAM block 0.

12.6.5 TRXPR – Transceiver Pin Register

Bit 7 6 5 4 3 2 1 0

NA ($139) Res3 Res2 Res1 Res0 Resx3 Resx2 SLPTR TRXRST

TRXPR

Read/Write R R R R RW RW RW RW

Initial Value 0 0 0 0 0 0 0 0

The register TRXPR allows to control basic actions of the radio transceiver like reset or

state transitions. The register bit functionality is inherited from the external pins of the

stand-alone radio transceiver.

• Bit 7:4 – Res3:0 - Reserved

• Bit 3:2 – Resx3:2 - Reserved

• Bit 1 – SLPTR - Multi-purpose Transceiver Control Bit

The bit SLPTR is a multi-functional bit to control transceiver state transitions.

Dependent on the radio transceiver state, a rising edge of bit SLPTR causes the

following state transitions: TRX_OFF => SLEEP (level sensitive), PLL_ON =>

BUSY_TX. Whereas the falling edge of bit SLPTR causes the following state transition:

SLEEP => TRX_OFF (level sensitive). When the radio transceiver is in TRX_OFF state

the microcontroller forces the transceiver to SLEEP by setting SLPTR = H. The

Transceiver awakes when the microcontroller releases the bit SLPTR. In states

PLL_ON and TX_ARET_ON, bit SLPTR is used as trigger input to initiate a TX

transaction. Here SLPTR is sensitive on rising edge only. After initiating a state change

by a rising edge at Bit SLPTR in radio transceiver states TRX_OFF, RX_ON or

RX_AACK_ON, the radio transceiver remains in the new state as long as the pin is

logical high and returns to the preceding state with the falling edge.

• Bit 0 – TRXRST - Force Transceiver Reset

The RESET state is used to set back the state machine and to reset all registers of the

transceiver to their default values. A reset forces the radio transceiver into the

TRX_OFF state and resets all transceiver register to their default values. A reset is

initiated with bit TRXRST = H. The bit is cleared automatically During transceiver reset

the microcontroller has to set the radio transceiver control bit SLPTR to the default

value.

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