EM77950 datasheet(66/102 Pages) EMC

66 / 102 page

EM77950

BB Controller

•

Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

Bit 7:

LOW_MODE

Enables or disables low power mode for RFW-102

: Disables low mode (normal mode).

: Enables low mode. BB is in RX mode, while RFW-102 is in TX mode.

User has to put the BB into RX mode to disable RX and Preamble search,

before enabling LOW_MODE. This transfers the RFW-102 to TX mode using

RX_TX pin, while the BB is still in RX mode.

RFW-102 power consumption is lower in TX mode than in RX mode. BB

cannot remain in TX mode, if it is not transmitting. The low mode is the

combination of both of the above.

Default Value:

0x01

8.3.8 System Control Register 4 (SCR4)

This register is a read and a write register.

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SCR4

N/A

FIFO

FLAGS

WIN

CONT

RF_AC

TIVE

Bit 0:

This flag enables all interrupts when set to ‘1’.

When ‘0’ all interrupts are disabled.

Bit 1:

RF_ACTIVE

This bit controls RF_ACTIVE pin. When this bit is high the RF Modem is active.

Bit 2:

WIN CONT

This bit determines the size of the WINDOW in the Preamble search module.

IF (BLR+6) > 14 and WIN_CONT=1, then the preamble window size is 5

Bit 3:

FIFO FLAGS

Determines the RX_FIFO AF flag and TX_FIFO AE flag:

IF FIFO FLAGS = 0 then AF = 12 and AE = 4.

IF FIFO FLAGS = 1 then AF = 8 and AE = 8.

Default Value:

0x00.

EM77950 Datasheet(PDF) 66 Page - ELAN Microelectronics Corp

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