PIN CONNECTIONS

Pin

Name

Dir

Description

a1

A14

Out

Address bus bit 14

a2

A12

Out

Address bus bit 12

a3

A10

Out

Address bus bit 10

a4

A9

Out

Address bus bit 9

a5

A8

Out

Address bus bit 8

a6

A7

Out

Address bus bit 7

a7

A6

Out

Address bus bit 6

a8

A5

Out

Address bus bit 5

a9

A4

Out

Address bus bit 4

a10

A3

Out

Address bus bit 3

a11

A2

Out

Address bus bit 2

a12

A1

Out

Address bus bit 1

a13

A0

Out

Address bus bit 0

a14

D7

I/O

Data bus bit 7

a15

D6

I/O

Data bus bit 6

a16

D5

I/O

Data bus bit 5

a17

D4

I/O

Data bus bit 4

a18

D3

I/O

Data bus bit 3

a19

D2

I/O

Data bus bit 2

a20

D1

I/O

Data bus bit 1

a21

D0

I/O

Data bus bit 0

a22

E*

Out

Clock, inverse of E, 1.2288MHz

a23

R/W*

I/O

Read/Write for Motorola-style chips

a24

WR*

Out

Write. For Intel-style peripherals

a25

SIN1

Inp

Main serial port input, RS232 levels

a26

NMI

Inp

Non-Maskable interrupt. Pull-up to +5V

a27

P27

Out

Port 2 bit 7. Switched to 0 by 232ON and 1 by 232OFF

a28

P26

I/O

Port 2 bit 6 or Timer Out 3

a29

P25

I/O

Port 2 bit 5 or Timer Out 2

a30

P56

I/O

Port 5 bit 6 or I2C clock out

a31

P57

I/O

Port 5 bit 7 or I2C data bus

a32

VIN

Inp

Power supply +6V to +16V (or 6V AC, see Fast Start Guide)

Pin

Name

Dir

Description

c1

A15

Out

Address bus bit 15

c2

A13

Out

Address bus bit 13

c3

A11

Out

Address bus bit 11

c4

P67

I/O

Port 6 bit 7 general purpose I/O

c5

P66

I/O

Port 6 bit 6 general purpose I/O

c6

P65

I/O

Port 6 bit 5 general purpose I/O

c7

P64

I/O

Port 6 bit 4 general purpose I/O

c8

P63

I/O

Port 6 bit 3 general purpose I/O

c9

P62

I/O

Port 6 bit 2 general purpose I/O

c10

P61

I/O

Port 6 bit 1 general purpose I/O

c11

P60

I/O

Port 6 bit 0 general purpose I/O

c12

P22

I/O

Port 2 bit 2 or serial clock in

c13

SOUT2

Out

Second serial port out, RS232 levels

c14

SIN2

Inp

Second serial port in, RS232 levels

c15

SW+5V

Out

Switched +5V output. Controlled by 232ON and 232OFF . Use to switch off other circuits to save power

c16

CS01C0

Out

Address 01C0-01CF decode. Positive active, strobed with E. Use for LCDs

c17

CS01B0*

Out

Address 01B0-01BF decode. Negative active, strobed with E. Do not use when keyboard words INKEY or NEWKEY are used (needed internally)

c18

CS01A0*

Out

Address 01A0-01AF decode. Negative active, not strobed with E

c19

CS0190*

Out

Address 0190-019F decode. Negative active, not strobed with E

c20

CS0180*

Out

Address 0180-018F decode. Negative active, not strobed with E

c21

STBY*

Inp

Standby input (hardware control)

c22

E

Out

Clock, 1.2288MHz

c23

RESET*

I/O

Use as output to other logic, or as input to reset the TDS9092. Use does not clear the RAM as does power-up

c24

RD*

Out

Read. For Intel-style peripherals

c25

SOUT1

Out

Main serial port output, RS232 levels

c26

P50

I/O

Port 5 bit 0 or IRQ1* interrupt input

c27

P51

I/O

Port 5 bit 1 or IRQ2* interrupt input

c28

P52

I/O

Port 5 bit 2 or Memory Ready input

c29

P53

I/O

Port 5 bit 3 or Halt* input

c30

P54

I/O

Port 5 bit 4 or Input Strobe* input

c31

P55

I/O

Port 5 bit 5 or Output Strobe* output

c32

GND

Gnd

Ground

Pin

Name

Dir

Description

PA0

PA0

I/O

Port A bit 0 general purpose I/O

PA1

PA1

I/O

Port A bit 1 general purpose I/O

PA2

PA2

I/O

Port A bit 2 general purpose I/O

PA3

PA3

I/O

Port A bit 3 general purpose I/O

PA4

PA4

I/O

Port A bit 4 general purpose I/O

PA5

PA5

I/O

Port A bit 5 general purpose I/O

PA6

PA6

I/O

Port A bit 6 general purpose I/O

PA7

PA7

I/O

Port A bit 7 general purpose I/O

PB0

PB0

I/O

Port B bit 0 general purpose I/O

PB1

PB1

I/O

Port B bit 1 general purpose I/O

PB2

PB2

I/O

Port B bit 2 general purpose I/O

PB3

PB3

I/O

Port B bit 3 general purpose I/O

PB4

PB4

I/O

Port B bit 4 general purpose I/O

PB5

PB5

I/O

Port B bit 5 general purpose I/O

PB6

PB6

I/O

Port B bit 6 general purpose I/O

PB7

PB7

I/O

Port B bit 7 general purpose I/O

Pin

Name

Dir

Description

-9V

V

Out

Output from DC-DC converter

+9V

+9V

Out

Output from DC-DC converter. Use with peripherals such as A to D

GND

GND

Gnd

Ground. Connected internally to c32

SHDN

SHDN

Inp

Shutdown. This input must be shorted to ground for correct operation

LBO*

LBO*

Out

Open drain low battery output

LBI*

LBI*

Inp

Leave open circuit for Low Battery operation or use as input with LBO* as inverted open drain output

VREC

VREC

Out

Normally same as VIN, but rectified DC output if powered from AC voltage (see Fast Start Guide)

+5VOUT

+5VOUT

Out

From on-board regulator. Maximum 180mA including TDS9092's own consumption