STR750F datasheet(15/73 Pages) STMICROELECTRONICS

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STR750F

Pin Description

15/71

Port Reset State

The reset state of the I/O ports is GPIO input floating. Exceptions are P1[19:16] and P0.13

which are configured as JTAG alternate functions:

●

The JTAG inputs (JTDI, JTMS and JTDI) are configured as input floating and are ready

to accept JTAG sequences.

●

The JTAG output JTDO is configured as floating when idle (no JTAG operation) and is

configured in output push-pull only when serial JTAG data must be output.

●

The JTAG output RTCK is always configured as output push-pull. It outputs '0' level

during the reset phase and then outputs the JTCK input signal resynchronized 3 times

by the internal AHB clock.

●

The GPIO_PCx registers do not control JTAG AF selection, so the reset values of

GPIO_PCx for P1[19:16] and P0. 13 are the same as other ports. Refer to the GPIO

section of the STR750 Reference Manual for the register description and reset values.

●

P0.11 and P0.00 are sampled by the boot logic after reset, prior to fetching the first

word of user code at address 0000 0000h.

●

When booting from SMI (and only in this case), the reset state of the following GPIOs is

"SMI alternate function output enabled":

–

P0.07 (SMI_DOUT)

–

P0.05 (SMI_CLK)

–

P0.04 (SMI_CS0)

–

P0.06 (SMI_DIN)

Note that the other SMI pins: SMI_CS1,2,3 (P0.12, P0.11, P0.10) are not affected.

To avoid excess power consumption, unused I/O ports must be tied to ground.

Table 5.

STR750F pin description

Pin n°

Pin Name

Input

Output

Main

function

(after

reset)

Alternate function

(1)

1B1

P1.12 /

ADC_IN13

I/O

XEIT12

Port 1.12

ADC: Analog

input 13

2B2

P0.02 /

TIM2_OC1 /

ADC_IN0

I/O

XEIT0

Port 0.02

TIM2: Output

Compare 1(2)

ADC: Analog

input 0

3B3

P0.01 / TIM0_TI1

/ MCO

I/O

XO8

Port 0.01

TIM0: Input

Capture / trigger

/ external clock 1

Main Clock

Output

4C2

P0.00 /

TIM0_OC1 /

BOOT0

I/O

XO8

Port 0.00 /

Boot mode

selection

input 0

TIM0: Output Compare 1

P0.31 / TIM1_TI2

I/O

XO2

Port 0.31

TIM1: Input Capture / trigger /

external clock 2

6D2

P0.30 /

TIM1_OC2

I/O

XO2

Port 0.30

TIM1: Output Compare 2

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