STA2500D datasheet(46/57 Pages) STMICROELECTRONICS

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Digital interfaces

STA2500D

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Doc ID 16067 Rev 1

7.4

The JTAG interface

The JTAG interface is compliant with the JTAG IEEE Standard 1149.1. It allows both the

boundary scan of the digital pins and the debug of the ARM7TDMI application when

connected with the standard ARM7 developments tools. It is also used for the industrial test

of the device. The JTAG interface is available through the following 5 pins: BT_GPIO_8,

BT_GPIO_9, BT_GPIO_10, BT_GPIO_11 and BT_GPIO_16.

7.5

Alternate I/O functions

The STA2500D has 10 additional general purpose pins on top of the 4 PCM pins, the 4

UART pins and BT_CLK_REQ_OUT_1 that can also be reconfigured. They are fully

programmable via specific HCI commands. They can be configured as input, output,

interrupt with asynchronous or synchronous edge or level detection and/or wake-up.

The alternative functions are:

●

Wake-up by the Host in Deep Sleep mode through UART or SPI with handshake (see

Section : Deep sleep mode entry and wake-up through H4 UART or H4 SPI with

handshake)

●

WLAN coexistence control

●

I2C interface

●

PCM synchronization

●

GPIOs

●

UART / SPI interface

●

external driver/LNA control for Class 1 operation.

19 pins can be redefined by SW to perform other functions. Pin BT_HOST_WAKEUP e.g.

can be redefined to perform up to 7 functions, depending on SW settings.

4 exemplary combinations of pin programmings are given in Table 29. The available

functions are

●

ex. 1: UART + I2C + Class 1 control

●

ex. 2: UART + WLAN + Class 1 control

●

ex. 3: SPI + WLAN + Class 1 control

●

ex. 4: SPI + WLAN + I2C + Class 1 control

(The complete list of alternate functions is available upon request).

Table 29.

Examples of BT_GPIO pin programming

STA2500D Pin Name

ex. 1

ex. 2

ex. 3

ex. 4

BT_UART_RXD/BT_SPI_DI

UART_RXD

SPI_DI

BT_UART_TXD/BT_SPI_DO

UART_TXD

SPI_DO

BT_UART_CTS/BT_SPI_CLK

UART_CTS

SPI_CLK

BT_UART_RTS/BT_SPI_CSN

UART_RTS

SPI_CS

BT_PCM_CLK

PCM_CLK

BT_PCM_SYNC

PCM_SYNC

BT_PCM_A

PCM_A

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