7

DA9191EB.006

June 30,1997

CONNECTOR DESCRIPTION

Connector name

Pin

Function

SBUS

MAS

uP

The SBUS interface. When using an external uP, leave the jumpers open and

connect the external uP to pins 1,2,3,4 and 5.

1

10

STB is the strobe signal input for the MAS9191A. Connect the pins together

when on-board uP is used.

2

9

SCL is the serial clock input for the MAS9191A. Connect the pins together

when on-board uP is used.

3

8

SRXD is the received data input for the MAS9191A. Connect the pins together

when on-board uP is used.

4

7

STXD is the transmit data output from MAS9191A. Connect the pins together

when on-board uP is used.

5

6

XINT interrupt line from MAS9191A. Connect the pins together when on-board

uP is used.

P4

This connector has six pins, which are connected to micro controller port E. All

the pins are inputs for the micro controller. The pin can either be an analog

input for the uP internal A/D-converter or general purpose digital input.

1

Input PE2.

2

Input PE3.

3

Input PE4.

4

Input PE5.

5

Input PE6.

6

Input PE7.

P5

This connector is closed when MAS9191A generates the clock to the uP. In this case

C50,C51, X2 and R23 should not be mounted.

1 and 2

shorted

uP uses 4.8MHz clock from MAS9191A.

1 and 2

open

uP uses crystal X2

P2

Keypad connector. The keypad is a 4 x 3 matrix, which has the following truth table. The

outputs are driven by 74HC244.

Key

Output

Input

PA6

PA5

PA4

PA3

PA2

PA1

PA0

1

1

1

1

0

1

1

0

2

1

1

1

0

1

0

1

3

1

1

1

0

0

1

1

4

1

1

0

1

1

1

0

5

1

1

0

1

1

0

1

6

1

1

0

1

0

1

1

7

1

0

1

1

1

1

0

8

1

0

1

1

1

0

1

9

1

0

1

1

0

1

1

•

0

1

1

1

1

1

0

0

0

1

1

1

1

0

1

#

0

1

1

1

0

1

1