ZB21 datasheet(3/5 Pages) ETC2

3 / 5 page

Amp’ed RF, Inc.

(phone) 408 213-9530

(fax) 408 213-9533

Pin Assignment

Name

Type

Pin#

Description

Alt Function

VIN

GND

11, 23

GND

UART Interface

RXD

Receive data

TXD

Transmit data

CTS

Clear to send (active low)

RTS

Request to send (active low)

Special Function for Flash ROM

SYSCLK

Input System Clock (4-33MHz)

External Clock Input

(optional)

MODE2

System Clock Source:

Internal (H),External (L)

BOOT0

Input (active low)

Boot ROM, high

Application ROM, low

MODE3

(Default: Pull Down)

Reserved for testing

RESET

Reset input (active low for 5 ms);

GPIO – General Purpose Input/Output

GPIO [0]

I/O

General Purpose Input/Output

SPI; MOSI

GPIO [1]

I/O

General Purpose Input/Output

SPI; SCLK

GPIO [2]

I/O

General Purpose Input/Output

SPI; SSN

GPIO [3]

I/O

General Purpose Input/Output

A/D, AIN2

GPIO [4]

I/O

General Purpose Input/Output

A/D, AIN0

GPIO [5]

I/O

General Purpose Input/Output

20mA current sink

GPIO [6]

I/O

General Purpose Input/Output

20mA current sink

GPIO [7]

I/O

General Purpose Input/Output

20mA current sink

GPIO [8]

I/O

General Purpose Input/Output

GPIO [9]

I/O

General Purpose Input/Output

A/D, AIN3

GPIO [10]

I/O

General Purpose Input/Output

A/D, AIN1

GPIO [11]

I/O

General Purpose Input/Output

SPI; MISO

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KC21 Datasheet 03/3/2008

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