9202 datasheet(16/175 Pages) STMICROELECTRONICS

16 / 175 page

UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV

16/175

P4.3

PWM0

I/O

General I/O port pin

8-bit Pulse Width Modulation

output 0

P4.4

PWM1

I/O

General I/O port pin

8-bit Pulse Width Modulation

output 1

P4.5

PWM2

I/O

General I/O port pin

8-bit Pulse Width Modulation

output 2

P4.6

PWM3

I/O

General I/O port pin

8-bit Pulse Width Modulation

output 3

P4.7

PWM4

I/O

General I/O port pin

Programmable 8-bit Pulse Width

modulation output 4

USB-

I/O

USB Pin. Pull-up resistor required

(2k

Ω for 3V devices, 7.5kΩ for 5V

devices) for all devices, with or

without USB function.

USB+

I/O

USB Pin. Pin is not connected for

device with no USB function.

AVREF

Reference Voltage input for ADC

RD_

READ signal, external bus

WR_

WRITE signal, external bus

PSEN_

PSEN signal, external bus

ALE

Address Latch signal, external bus

RESET_

Active low RESET input

XTAL1

Oscillator input pin for system clock

XTAL2

Oscillator output pin for system clock

PA0

I/O

General I/O port pin

1. PLD Macro-cell outputs

2. PLD inputs

3. Latched Address Out (A0-A7)

4. Peripheral I/O Mode

PA1

I/O

General I/O port pin

PA2

I/O

General I/O port pin

PA3

I/O

General I/O port pin

PA4

I/O

General I/O port pin

PA5

I/O

General I/O port pin

PA6

I/O

General I/O port pin

PA7

I/O

General I/O port pin

Port Pin

Signal

Name

Pin No.

In/Out

Function

Basic

Alternate

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