EM77950 datasheet(49/102 Pages) EMC

49 / 102 page

EM77950

BB Controller

Product Specification (V1.0) 10.09.2007

• 41

(This specification is subject to change without further notice)

Name

Type

Description

DATA [0-7]

I/O

This bus comprises of eight TRI-STATE input/output lines. The bus

provides bidirectional communication between the system and the

MCU. Data, control words, and status information are transferred

via the DATA [0-7] data bus.

RD_n

When RD_n is low while the system is enabled, BB outputs one of its

internal register values to DATA[0-7] according to RAM_ADDR[0-6].

WR_n

When WR_n is low while the system is enabled, BB enables writing

to its internal registers. The register is determined by RAM_ADDR

[0-6] and the value DATA[0-7].

RAM_ADDR[0-6]

These four input signals determine the register to which the MCU

writes to or reads from.

CS_n

Chip select input pin. When CS_n is low, the chip is selected; when

high, the chip is disabled. This pin overrides all pins excluding RST.

This enables communication between BB and the MCU.

This pin functions as wakeup pin for power-down and idle modes.

TX_AE;

TX_EMPTY;

RX_AF;

CS;

LOCK_IN;

LOCK_OUT

Interrupt driver pins.

This pin goes high whenever any of the interrupt sources has an

active high condition and is enabled via the IER. The purpose of this

pin is to notify the MCU through its external interrupt pin that an

event (such as empty TX_FIFO) has occurred.

Goes low when IER register is read.

RST

Chip’s reset pin.

When this pin is set high, all registers and FIFOs are cleared to their

initial values. All transceiver traffic is disabled and aborted. Reset is

asynchronous to system clock.

After power-up, a pulse in RST input should be applied (by POR).

SHDWN

Shut Down BB

RF_ACTIVE

This output pin controls the RFW102 working/shutdown mode. Its

values are determined by SCR4(1).

SERIAL_IO

I/O

Serial input or output according to TX_RX mode.

It functions as serial interface for the RFW-102 (RFWAVES

modem).

When SERIAL_IO is input, it is a Schmitt-trigger input.

RX_TX

This pin controls RFW-102 operation mode. It should be connected

to RFW-102 RX_TX input pin.

When RX_TX is low, RFW-102 is in receiving mode.

When RX_TX is high, RFW-102 is in transmitting mode.

In most cases RX_TX output pin is determined by SCR2(0) register.

SCR3(7) and the capacitor discharge mechanism affects this pin.

RF_CLK

Clock for RF operation

EM77950 датащи(PDF) 49 Page - ELAN Microelectronics Corp

EM77950 датащи(HTML) 49 Page - ELAN Microelectronics Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL