Table 3-16. Bluetooth Host Processor Uart I/O; Figure 3-55. Bluetooth Lf Uart Connection Block Diagram - Motorola APX 5000 Service Manual

Theory of Operation
: Bluetooth
3.5.3 Bluetooth I/Os.
The communication between the Bluetooth IC and the host controller is by a four-wire HCI USART0
bus (RX, TX, CTS, RTS). The Bluetooth IC receives a firmware update over USART0 each time it is
powered on. The LF receiver IC transmits its data over the USART1 s used for displaying debugging
messages.
Signal Name
USART0 – RXD
USART0 – TXD
USART0 – RTS
USART0 – CTS
USART1 – RXD
USART1 – TXD
USART1 – CLK
USART2 – RXD
USART2 – TXD

Table 3-16. Bluetooth Host Processor UART I/O

Pad Name
PA00
PA01
PA03
PA04
PA05
PA06
PA07
PB29
PB30
ATMEL AVR32
AT32UC3A0512
Pin 19
Pin 20
USART2
Debug RX
K6
Pin 12
PB29
Debug TX
K7
Pin 13
PB30

Figure 3-55. Bluetooth LF UART Connection Block Diagram

GPIO MUX
Function
0 A BT_UART_TX_3.3V
1 A BT_UART_RX_3.3V
3 A BT_UART_CTS_3.3V
4 A BT_UART_RTS_3.3V
5 A USART1_RX
6 A USART1_TX
7 A USART1_CLK
61 A AVR_USART2_RX
62 A AVR_USART2_TX
USART0
J6
PA00
H6
PA01
J7
PA03
J8
PA04
USART1
K11
PA05
J10
PA07
L12
PA06
= Level Translator. 3.3volts on AVR side
Expansion Board I/O
Schematic Name
I
O
O
I
I
O
I
I
O
TI NL 5500
Bluetooth/GPS
A4
HCI_TX
B5
HCI_RX
B4
HCI_CTS
B7
HCI_RTS
Low Frequency
Receiver AS3930
9
DAT
10
CL_DAT
LF Transmit
(OR Gate)
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