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Motorola W24 Manuale Utente

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Chapter 2:  Hardware Interface Description
 May 31, 2008
Module Hardware Description
31
General Purpose I/O
W24 incorporates 8 General Purpose I/O interface. The interface consists of the following pins 
(see 
):
In Stand alone configuration, GPIO pins 1 to 3 act as general purpose inputs. 
GPIO pins 4 to 7 function as Bluetooth coexistence control/indicators for the W24 to use with a 
Bluetooth interface in order to avoid RF collision between Bluetooth and Wi-Fi transmission. 
There are 2, 3 or 4-wires coexistence configurations possible. Below is the functionality 
description of relevant signals:
Table 2-14: GPIO Interface Signals
Pin #
Pin Name
Description
28
GPIO1
General purpose I/O
30
GPIO2
General purpose I/O
32
GPIO3
General purpose I/O
34
GPIO4 / BT_PRIORITY
General purpose I/O / Bluetooth 
coexistence indication
36
GPIO5 / BT_FREQ
General purpose I/O, Bluetooth 
coexistence indication
38
GPIO6 / BT_STATE
General purpose I/O, Bluetooth 
coexistence indication
40
GPIO7 / WL_ACTIVE
General purpose I/O, Bluetooth 
coexistence indication
42
GPIO8
General purpose I/O
Pin Name
Direction
Description
GPIO4 / BT_PRIORITY
I
In 2-Wires coexistence: When High, BT is trans-
mitting or receiving high priority packets.
In 3-Wires coexistence: When High, BT PA is on or 
BT is receiving data.
GPIO5 / BT_FREQ
I
This pin is not used for 2-wire and 3-wire Bluetooth 
coexistence scheme. This pin can be used for 
4-wire interface if needed.
This pin should either be left floating or be con-
nected to ground.