S3F80JBPRODUCT OVERVIEW

Table 1-2. Pin Descriptions of 44-QFP (Continued)

Pin

Pin

Pin Description

Circuit

44 Pin

Shared

Names

Type

 

Type

No.

Functions

P3.1

I/O

I/O port with bit-programmable pin. Configurable to

4

4

REM

 

 

input mode, push-pull output mode, or n-channel

 

 

(SCLK)

 

 

open-drain output mode. Input mode with a pull-up

 

 

 

 

 

resistor can be assigned by software.

 

 

 

 

 

This port 3pin has high current drive capability.

 

 

 

 

 

Also P3.1 can be assigned individually as an

 

 

 

 

 

output pin for REM.

 

 

 

 

 

In the tool mode, P3.1 is assigned as serial MTP

 

 

 

 

 

interface pin; SCLK

 

 

 

P3.2–P3.3

I

C-MOS Input port with a pull-up resistor

5

17

(T0CK)

 

 

 

 

18

(T1CAP/T2CAP)

P3.4–P3.5

I/O

I/O port with bit-programmable pins. Configurable

2

13–14

 

 

to input mode or output mode. Pin circuits are

 

 

 

 

 

either push-pull or n-channel open-drain type. Pull-

 

 

 

 

 

up resistors can be assigned by software.

 

 

 

P4.0–P4.7

I/O

I/O port with bit-programmable pins. Configurable

2

38–41

 

 

to input mode or output mode. Pin circuits are

 

27–29

 

 

 

either push-pull or n-channel open-drain type.

 

19

 

XOUT, XIN

System clock input and output pins

7,8

nRESET

I

System reset signal input pin and back-up mode

6

12

 

 

input.

 

 

 

TEST

I

Test signal input pin

_

9

_

 

 

(for factory use only; must be connected to VSS.)

 

 

 

VDD

Power supply input pin

5

VSS

Ground pin

6

1-9

Page 27
Image 27
Samsung S3F80JB manual P3.1 Port with bit-programmable pin. Configurable to