STR910FAM32 datasheet(45/99 Pages) STMICROELECTRONICS

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STR91xFAx32 STR91xFAx42 STR91xFAx44

Pin description

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5.2

Default pin functions

During and just after reset, all pins on ports 0-9 default to high-impedance input mode until

CPU firmware assigns other functions to the pins. This initial input mode routes all pins on

ports 0-9 to be read as GPIO inputs as shown in the “Default Pin Function” column of

Table 9. Simultaneously, certain port pin signals are also routed to other functional inputs as

shown in the “Default Input Function” column of Table 9, and these pin input functions will

remain until CPU firmware makes other assignments. At any time, even after the CPU

assigns pins to alternate functions, the CPU may always read the state of any pin on ports

0-9 as a GPIO input. CPU firmware may assign alternate functions to port pins as shown in

columns “Alternate Input 1” or “Alternate Output 1, 2, 3” of Table 9 by writing to control

registers at run-time.

5.2.1

General notes on pin usage

Note:

STMicroelectronics advises to ground, or pull up to VDDQ using a 100 KΩ resistor, all unused

pins on port 0 - 9 to reduce noise susceptibility, noise generation, and minimize power

consumption. There are no internal or programmable pull-up resistors on ports 0-9.

All pins on ports 0 - 9 are 5V tolerant

Pins on ports 0,1,2,4,5,7,8,9 have 4 mA drive and 4mA sink. Ports 3 and 6 have 8 mA drive

and 8 mA sink.

For 8-bit non-muxed EMI operation: Port 8 is eight bits of data, ports 7 and 9 are 16 bits of

address.

For 16-bit muxed EMI operation: Ports 8 and 9 are 16 bits of muxed address and data bits,

port 7 is up to eight additional bits of high-order address

Signal polarity is programmable for interrupt request inputs, EMI_ALE, timer input capture

inputs and output compare/PWM outputs, motor control tach and emergency stop inputs,

and motor control phase outputs.

HiZ = High Impedance, V = Voltage Source, G = Ground, I/O = Input/Output

STR910FA devices do not support USB. On these devices USBDP and USBDN signals are

"Not Used" (USBDN is not connected, USBDP must be pulled up by a 1.5K ohm resistor to

VDDQ), and all functions named “USB" are not available.

STR910FA 128-pin and 144-ball devices do not support Ethernet. On these devices

PHYCLK and all functions named “MII*" are not available.

Table 9.

Device pin description

Pkg

Name

Default Pin

Function

Default

Input

Function

Alternate functions

Alternate

Input 1

Alternate

Output 1

Alternate

Output 2

Alternate

Output 3

L11

P0.0

I/O

GPIO_0.0,

GP Input, HiZ

MII_TX_CLK,

PHY Xmit clock

I2C0_CLKIN,

I2C clock in

GPIO_0.0,

GP Output

I2C0_CLKOUT,

I2C clock out

ETM_PCK0,

ETM Packet

K10

P0.1

I/O

GPIO_0.1,

GP Input, HiZ

I2C0_DIN,

I2C data in

GPIO_0.1,

GP Output

I2C0_DOUT,

I2C data out

ETM_PCK1,

ETM Packet

J11

P0.2

I/O

GPIO_0.2,

GP Input, HiZ

MII_RXD0,

PHY Rx data0

I2C1_CLKIN,

I2C clock in

GPIO_0.2,

GP Output

I2C1_CLKOUT,

I2C clock out

ETM_PCK2,

ETM Packet

H12

P0.3

I/O

GPIO_0.3,

GP Input, HiZ

MII_RXD1,

PHY Rx data

I2C1_DIN,

I2C data in

GPIO_0.3,

GP Output

I2C1_DOUT,

I2C data out

ETM_PCK3,

ETM Packet

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