Multiplexed Bluetooth Gpio Signals - Infineon Cypress CYW43353 Manual

12.3.1 Multiplexed Bluetooth GPIO Signals

The Bluetooth GPIO pins (BT_GPIO_0 to BT_GPIO_7) are multiplexed pins and can be programmed to be used as GPIOs or for other Bluetooth interface signals such as
2
I S. The specific function for a given BT_GPIO_X pin is chosen by programming the Pad Function Control register for that specific pin.
for each BT_GPIO_X pin. Note that each BT_GPIO_X pin's Pad Function Control register setting is independent (BT_GPIO_1 can be set to pad function 7 at the same time
that BT_GPIO_3 is set to pad function 0). When the Pad Function Control register is set to 0, the BT_GPIOs do not have specific functions assigned to them and behave as
generic GPIOs. The A_GPIO_X pins described below are multiplexed behind the CYW43353's PCM and I
Table 19. GPIO Multiplexing Matrix
Pin Name
BT_UART_CTS_N UART_CTS_N
BT_UART_RTS_N UART_RTS_N
BT_UART_RXD UART_RXD
BT_UART_TXD UART_TXD
BT_PCM_IN A_GPIO[3]
BT_PCM_OUT A_GPIO[2]
BT_PCM_SYNC A_GPIO[1]
BT_PCM_CLK A_GPIO[0]
BT_I2S_DO A_GPIO[5]
BT_I2S_DI A_GPIO[6]
BT_I2S_WS GPIO[7]
BT_I2S_CLK GPIO[6]
BT_GPIO_1 GPIO[1]
BT_GPIO_0 GPIO[0]
CLK_REQ WL/BT_CLK_REQ
The multiplexed GPIO signals are described in
Document Number: 002-14949 Rev. *G
0 1
–
–
–
–
PCM_IN PCM_IN
PCM_OUT PCM_OUT
PCM_SYNC PCM_SYNC
PCM_CLK PCM_CLK
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
–
–
–
Table 20.
PRELIMINARY
Pad Function Control Register Setting
2 3
– –
– –
– –
– –
HCLK
LINK_IND
HCLK INT_LPO
–
– – I2S_SSDO
– HCLK I2S_SSDI/MSDI
– LINK_IND
– – INT_LPO
– –
– – clk_12p288
– –
Table 19
2
S interface pins.
4 5 6
– – – A_GPIO[1]
– – – A_GPIO[0]
– – –
– – –
– – – I2S_SSDI/MSDI
– I2S_MSDO – I2S_SSDO
I2S_MWS – I2S_SWS
– I2S_MSCK – I2S_SSCK
I2S_MSDO –
– – TX_CON_FX
– I2S_MWS – I2S_SWS
I2S_MSCK – I2S_SSCK
– – – CLASS1[2]
– –
– – – A_GPIO[7]
CYW43353
shows the possible options
7 15
–
–
GPIO[5] –
GPIO[4] –
SF_MISO
SF_MOSI
SF_SPI_CSN
SF_SPI_CLK
STATUS –
–
–
–
–
– –
–
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