ST7232A datasheet(9/154 Pages) STMICROELECTRONICS

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ST7232A

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PIN DESCRIPTION (Cont’d)

For external pin connection guidelines, refer to See “ELECTRICAL CHARACTERISTICS” on page 111.

Legend / Abbreviations for Table 1:

Type:

I = input, O = output, S = supply

Input level:

A = Dedicated analog input

In/Output level: C = CMOS 0.3VDD/0.7VDD

CT= CMOS 0.3VDD/0.7VDD with input trigger

Output level:

HS = 20mA high sink (on N-buffer only)

Port and control configuration:

– Input:

float = floating, wpu = weak pull-up, int = interrupt 1), ana = analog ports

– Output:

OD = open drain 2), PP = push-pull

Refer to “I/O PORTS” on page 40 for more details on the software configuration of the I/O ports.

The RESET configuration of each pin is shown in bold. This configuration is valid as long as the device is

in reset state.

Table 1. Device Pin Description

Pin N°

Pin Name

Level

Port

Main

function

(after

reset)

Alternate Function

Input

Output

VAREF

Analog Reference Voltage for ADC

VSSA

Analog Ground Voltage

PF0/MCO/AIN8

I/O CT

ei1

Port F0

Main clock

out (fOSC/2)

ADC Analog

Input 8

PF1 (HS)/BEEP

I/O CT HS

ei1

Port F1

Beep signal output

PF4/OCMP1_A/

AIN10

I/O CT

Port F4

Timer A Out-

put Com-

pare 1

ADC Analog

Input 10

PF6 (HS)/ICAP1_A

I/O CT HS

Port F6

Timer A Input Capture 1

710

PF7 (HS)/

EXTCLK_A

I/O CT HS

Port F7

Timer A External Clock

Source

811

PC0/OCMP2_B/

AIN12

I/O CT

Port C0

Timer B Out-

put Com-

pare 2

ADC Analog

Input 12

912

PC1/OCMP1_B/

AIN13

I/O CT

Port C1

Timer B Out-

put Com-

pare 1

ADC Analog

Input 13

10 13 PC2 (HS)/ICAP2_B

I/O CT HS

Port C2

Timer B Input Capture 2

11 14 PC3 (HS)/ICAP1_B

I/O CT HS

Port C3

Timer B Input Capture 1

12 15

PC4/MISO/ICCDA-

I/O CT

Port C4

SPI Master

In / Slave

Out Data

ICC Data In-

put

13 16 PC5/MOSI/AIN14

I/O CT

Port C5

SPI Master

Out / Slave

In Data

ADC Analog

Input 14

14 17 PC6/SCK/ICCCLK

I/O CT

Port C6

SPI Serial

Clock

ICC Clock

Output

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