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

a27

Not used

a28

Not used

a29

Not used

a30

P12

I/O

Port 1 bit 2 or I²C clock out

a31

P14

I/O

Port 1 bit 4 or I²C data bus

a32

VIN

Inp

Power supply +6V to +16V

Pin

Name

Dir

Description

c1

P0A15*

Out

Inverted Address bus bit 15, but logic 1 if A16 to A19 are not all 0 (i.e. not Page 0)

c2

A13

Out

Address bus bit 13

c3

A11

Out

Address bus bit 11

c4

P77

I/O

Port 7 bit 7 general purpose I/O or out pin for output compare A from timer 1

c5

P76

I/O

Port 7 bit 6 general purpose I/O, or input external clock for timer 3 or out pin for output compare B from timer 3

c6

P75

I/O

Port 7 bit 5 general purpose I/O, or input external clock for timer 2 or out pin for output compare B from timer 2

c7

P74

I/O

Port 7 bit 4 general purpose I/O, or input external clock for timer 1 or out pin for output compare B from timer 1

c8

P73

I/O

Port 7 bit 3 general purpose I/O, or input pin for input capture of timer 3 or reset input for 8-bit timer

c9

P72

I/O

Port 7 bit 2 general purpose I/O or input pin for input capture of timer 2

c10

P71

I/O

Port 7 bit 1 general purpose I/O or input pin for input capture of timer 1

c11

P70

I/O

Port 7 bit 0 general purpose I/O or clock input for 8-bit timer

c12

P97

I/O

Port 9 bit 7 general purpose I/O 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

CS81C0

Out

Address 81C0-81CF decode. Positive active, strobed with E. Use for LCDs

c17

CS81B0*

Out

Address 81B0-81BF decode. Negative active, strobed with E. Do not use when keypad words INKEY or NEWKEY are used, (needed internally)

c18

CS81A0*

Out

Address 81A0-81AF decode. Negative active, not strobed with E

c19

CS8190*

Out

Address 8190-819F decode. Negative active, not strobed with E

c20

CS8180*

Out

Address 8180-818F 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 TDS2020F. Use does not clear the compiled program or time and date as does power-up

c24

RD*

Out

Read. For Intel-style peripherals

c25

SOUT1

Out

Main serial port output, RS232 levels

c26

P15

I/O

Port 1 bit 5 general purpose I/O or IRQ0* interrupt i/p

c27

P16

I/O

Port 1 bit 6 general purpose I/O or IRQ1* interrupt i/p

c28

P17

I/O

Port 1 bit 7 general purpose I/O or 8-bit timer output

c29

P13

I/O

Port 1 bit 3. Switched to 0 by 232ON and 1 by 232OFF

c30

Not used

c31

P10

I/O

Port 1 bit 0 general purpose input, or 9.8304 MHz �-clock output

c32

GND

Gnd

Ground

Pin

Name

Dir

Description

z1

SHDN

Inp

Shutdown. This input must be open circuit for correct operation. Raise it above 2.0V to close down the TDS2020F input voltage regulator.

z2

P0A15*

Out

Inverted Address bus bit 15, but logic 1 if A16 to A19 are not all 0 (i.e. not Page 0). Same as pin c1. Duplicated so that it can be used with piggyback boards on TDS2020F.

z3

VBATT

Inp

Input for memory and clock preserving battery, 2.0 to 5.8V at 3.5�A typical. The TDS2020BYN & TDS2020BYD battery boards connect to this pin

z4

A80000*

Out

Address 80000-FFFFF decode. Negative active. Used by memory expansion.

z5

VPROT

Out

Memory protect power supply. Used by memory expansion piggy-back boards

z6

WR*

Out

Write. For Intel-style peripherals. Same as pin a24. Duplicated so that it can be used with piggyback boards on TDS2020F

z7

MODE

Inp

When open circuit H8/532 microprocessor is in Mode 4, expanded maximum mode on-chip PROM enabled. When tied to +5V it is in Mode 3, expanded maximum mode with on-chip PROM not enabled. Adding the TDS2020DV development piggyback board automatically ties this to +5V and switches out the microprocessor's internal PROM.

z8

P0*

Out

Address 00000-0FFFF decode (Page 0) Negative active. Used by TDS2020DV board.

z9

A04000*

Out

Address 04000-07FFF decode. Negative Active. Used by TDS2020DV board.

z10

A00000*

Out

Address 00000-03FFF decode. Negative Active. Used by TDS2020DV board.

z11

A19

Out

Address bus bit 19

z12

A18

Out

Address bus bit 18

z13

A17

Out

Address bus bit 17

z14

A16

Out

Address bus bit 16

z15

A15

Out

Address bus bit 15

z16

+8V

Out

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

z17

-8V

Out

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

z18

+5VOUT

Out

From on-card regulator. Max 100mA current including TDS2020F's own consumption. There is also a power dissipation limit on the voltage regulator. See POWER SUPPLY FUNCTIONS, page 121.

z19

P94/PW3

Out

Port 9 bit 4 general purpose I/O or Digital to Analog channel 3 Pulse Width Modulated output

z20

P93/PW2

Out

Port 9 bit 3 general purpose I/O or Digital to Analog channel 2 Pulse Width Modulated output

z21

P92/PW1

Out

Port 9 bit 2 general purpose I/O or Digital to Analog channel 1 Pulse Width Modulated output

z22

GND

Gnd

Ground. Same as pin c32. Duplicated so that it can be used with piggyback boards on pin connector version of TDS2020F.

z23

AGND

Gnd

Analog Ground. Cut link T to get separate ground for A to D converter

z24

P80/AN0

Inp

Port 8 bit 0 general purpose input or A to D input 0

z25

P81/AN1

Inp

Port 8 bit 1 general purpose input or A to D input 1

z26

P82/AN2

Inp

Port 8 bit 2 general purpose input or A to D input 2

z27

P83/AN3

Inp

Port 8 bit 3 general purpose input or A to D input 3

z28

P84/AN4

Inp

Port 8 bit 4 general purpose input or A to D input 4

z29

P85/AN5

Inp

Port 8 bit 5 general purpose input or A to D input 5

z30

P86/AN6

Inp

Port 8 bit 6 general purpose input or A to D input 6

z31

P87/AN7

Inp

Port 8 bit 7 general purpose input or A to D input 7

z32

AVCC

I/O

Analog Reference. Cut link S if separate reference is used for A to D converter

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