TC35681FSG datasheet(14/91 Pages) TOSHIBA

14 / 91 page

TC35680FSG-002/TC35681FSG-002

2019-04-04

2.4. List of Functions of GPIO Pins

Some GPIO pins are used as multiplexed function pins. They have multiple functions such as a serial interface and others as well

as a general-purpose I/O. The basic setting of the assignment of the function is done at boot timing by the built-in firmware program

in the mask ROM. After boot up, a user application or a proper command from the host CPU can set expected functions to the

corresponding GPIO pins.

Table 2-2 shows the status of each GPIO pin before the built-in firmware finishes the boot setting. And the functions which can be

assigned to each GPIO by a user application program are shown in the same table. Unused pins can be open. “Disable” in the table

means that both the input and output functions are disabled.

Some examples of the function setting are shown in Table 2-3.

Since it is not possible to assign one function to multiple GPIO pins simultaneously, care should be taken in function assignment for

GPIO pins.

For details of the GPIO function, refer also to Section 4.6.

Table 2-2 Multiple functions of GPIO

Pin name

(Function 0)

I/O function/Pin status

Function 1

Function 2

Function 3

Function 4

ADC

During reset

Boot setting

GPIO0

Disable/Hi-Z

—

GPIO1

(Note 1)

Disable/

Pull-up

Input/Pull-up

Input/Pull-down

(Note 2)

—

GPIO2

Disable/Pull-up

PWM1 output

—

GPIO3

Disable/Hi-Z

PWM2 output

SPI-DOUT1

output

—

ADC1

input

GPIO4

Disable/Hi-Z

PWM3 output

SPI-DIN1

input

—

ADC2

input

GPIO5

Disable/Pull-up (Note 3)

UART1-TX output

—

GPIO6

Disable/Pull-up (Note 4)

UART1-RX input

—

GPIO7

Disable/Pull-up (Note 5)

I2C-SCL1

input and output

—

SPI-SCS1

input and output

UART1-RTSX

output

—

GPIO8

Disable/Pull-up (Note 5)

I2C-SDA1

input and output

—

SPI-SCLK1

output

UART1-CTSX

input

—

GPIO9

Disable/Hi-Z

I2C-SCL2

input and output

—

ADC3

input

GPIO10

Disable/Hi-Z

I2C-SDA2

input and output

—

ADC4

input

GPIO11

Disable/Pull-up

I2C-SCL2

input and output

SPI-DOUT2

output

—

GPIO12

Disable/Pull-up

I2C-SDA2

input and output

SPI-DIN2

input

—

GPIO13

Disable/Pull-up

UART1-RTSX

output

PWM0

output

SPI-SCS2

input and output

UART2-RTSX

output

—

GPIO14

Disable/Hi-Z

UART1-CTSX

input

SLEEPCLK

output

SPI-SCLK2

output

UART2-CTSX

input

ADC5

input

GPIO15

Disable/Hi-Z

—

GPIO16

Disable/Pull-up

UART2-TX output

—

GPIO17

Disable/Pull-up

UART2-RX input

—

Note 1: This pin is used to switch an operating mode at the reset deassertion.

Note 2: “Input/Pull-up” in the User-App mode, and “Input/Pull-down” in the HCI mode or the Complete mode.

Note 3: “Disable/Pull-up” in the User-App mode, and “Output” in the HCI mode and the Complete mode. Function 1 is assigned.

Note 4: “Disable/Pull-up” in the User-App mode, and “Input/Pull-up” in the HCI mode and the Complete mode. Function 1 is assigned.

Note 5: When TC35681 is used, Function 1 is assigned in the User-App mode.

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