1–4

1.5

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

DM0

19

I/O

Differential data-minus USB port 0: upstream

DM1

6

I/O

Differential data-minus port-1: downstream

DM2

63

I/O

Differential data-minus port-2: downstream

DP0

18

I/O

Differential data-plus USB port 0: upstream

DP1

7

I/O

Differential data-plus port-1: downstream

DP2

64

I/O

Differential data-plus port-2: downstream

GND

5, 20, 24,

42, 59

—

Power supply ground

OVCR1

4

I

Port-1: Overcorrect indicator; Schmitt-trigger input, 100-

µA active pullup

OVCR2

1

I

Port-2: Overcorrect indicator; Schmitt-trigger input, 100-

µA active pullup

P0.[0:7]

43, 44, 45,

46, 47, 48,

49, 50

I/O

General-purpose I/O port 0 bits 0–7, Schmitt-trigger input, 100-

µA active pullup, open drain output†

P1.[0:7]

31, 32, 33,

34, 35, 36,

40, 41

I/O

General-purpose I/O port 1 bits 0–7, Schmitt-trigger input, 100-

µA active pullup, open drain output†

P2.[0:7]

22, 23, 25,

26, 27, 28,

29, 30

I/O

General-purpose I/O port 2 bits 0–7, Schmitt-trigger input, 100-

µA active pullup, open drain output†

P3.0/S0/RXD

58

I/O

P3.0: General-purpose I/O port 3 bit 0, Schmitt-trigger input, 100-

µA active pullup, open drain output†

S0: See Section 2.6.12

RXD: Can be used as a UART interface

P3.1/S1/TXD

57

I/O

P3.1: General-purpose I/O port 3 bit 1, Schmitt-trigger input, 100-

µA active pullup, open drain output†

I/O

S1: See Section 2.6.12

I/O

TXD: Can be used as a UART interface

P3.2

56

I/O

General-purpose I/O port 3 bit 2, Schmitt-trigger input, 100-

µA active pullup, open drain output†; INT0

only used internally (see Section 2.9.4)

P3.3

55

I/O

General-purpose I/O port 3 bit 3, Schmitt-trigger input, 100-

µA active pullup, open drain output†;

may support INT1 input, depending on configuration (see Figure 2–5)

P3.[4:7]

54, 53, 52,

51

I/O

General-purpose I/O port 3 bit 4, Schmitt-trigger input, 100-

µA active pullup, open drain output†

PUR

17

O

Pullup resistor connection pin (3-state); push-pull CMOS output (

±8 mA)

PWRO1

3

O

Port-1: power on/off control signal; push-pull CMOS output (

±8mA)

PWRO2

2

O

Port-2: power on/off control signal; push-pull CMOS output (

±8mA)

RST

13

I

Controller master reset signal, Schmitt-trigger input, 100-

µA active pullup

S2

8

I

General-purpose input; can be used for VID/PID selection under firmware control. This input has no

internal pullup, so it must be driven/pulled either low or high and connot be left unconnected.

S3

9

I

General-purpose input. This input has no internal pullup, so it must be driven/pulled either low or high

and connot be left unconnected.

SCL

12

O

Serial clock I2C; push-pull output

SDA

11

I/O

Serial data I2C; open drain output†

SELF/BUS

21

I

USB power MODE select: self-powered (HIGH), bus-powered (LOW)

SUSP

16

O

Suspend status signal: suspended (HIGH); unsuspended (LOW)

TEST0‡

14

I

Test input0, Schmitt-trigger input, 100-

µA active pullup

TEST1‡

15

I

Test input1, Schmitt-trigger input, 100-

µA active pullup

† All open-drain output pins can sink up to 8 mA.

‡ The functions controlled by TEST0 and TEST1 are shown in the following table. Because these two pins have internal pullups, they can be left

unconnected for the default mode.