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ST72F321R9TA

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE

STMicroelectronics 

ST72321

PIN DESCRIPTION (Cont’d)

For external pin connection guidelines, refer to See “ELECTRICAL CHARACTERISTICS” on page 136.

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

TT= TTL 0.8V / 2V with Schmitt 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

– Output:

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

Refer to “I/O PORTS” on page 46 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

Input

Output

Main

function

(after

reset)

Alternate function

1 - PE4 (HS)

2 - PE5 (HS)

3 - PE6 (HS)

4 - PE7 (HS)

5 2 PB0/PWM3

6 3 PB1/PWM2

7 4 PB2/PWM1

8 5 PB3/PWM0

9 6 PB4 (HS)/ARTCLK

10 - PB5 / ARTIC1

11 - PB6 / ARTIC2

12 - PB7

13 7 PD0/AIN0

14 8 PD1/AIN1

15 9 PD2/AIN2

16 10 PD3/AIN3

17 11 PD4/AIN4

18 12 PD5/AIN5

19 - PD6/AIN6

20 - PD7/AIN7

21 13 VAREF

22 14 VSSA

23 - VDD_3

I/O CT HS X X

X X Port E4

I/O CT HS X X

X X Port E5

I/O CT HS X X

X X Port E6

I/O CT HS X X

X X Port E7

I/O CT

X ei2

X X Port B0 PWM Output 3

I/O CT

X ei2

X X Port B1 PWM Output 2

I/O CT

X ei2

X X Port B2 PWM Output 1

I/O CT

X

ei2

X X Port B3 PWM Output 0

I/O CT HS X ei3

X X Port B4 PWM-ART External Clock

I/O CT

X ei3

X X Port B5 PWM-ART Input Capture 1

I/O CT

X ei3

X X Port B6 PWM-ART Input Capture 2

I/O CT

X

ei3

X X Port B7

I/O CT

XX

X X X Port D0 ADC Analog Input 0

I/O CT

XX

X X X Port D1 ADC Analog Input 1

I/O CT

XX

X X X Port D2 ADC Analog Input 2

I/O CT

XX

X X X Port D3 ADC Analog Input 3

I/O CT

XX

X X X Port D4 ADC Analog Input 4

I/O CT

XX

X X X Port D5 ADC Analog Input 5

I/O CT

XX

X X X Port D6 ADC Analog Input 6

I/O CT

XX

X X X Port D7 ADC Analog Input 7

I

Analog Reference Voltage for ADC

S

Analog Ground Voltage

S

Digital Main Supply Voltage

10/185

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