| Pin | I/O | Symbol | Function | President George |
|---|
| 1 | | NUMO | Non-user pin. Do not connect it to any lines | Not connected |
| 2 | | NUMG | Non-user pin. Connect it to GND | Not connected |
| 3 | | AVcc | Power pin for A/D converter | + 5 Volt |
| 4 | I | AN0 | Analog input pin for A/D converter | Not connected |
| 5 | I | AN1 | Analog input pin for A/D converter | Meter level input (RF/SWR/S/MOD) |
| 6 | I | AN2 | Analog input pin for A/D converter | Channel UP/DOWN from Mic. |
| 7 | I | AN3 | Analog input pin for A/D converter | Not connected |
| 8 | I | AVss | Ground pin for A/D converter | 0 Volt |
| 9 | I | TEST | Used for factory testing only. Connect this pin to Vcc | |
| 10 | I | OSC 1 | Input pin for the internal oscillator circuit | |
| 11 | O | OSC 2 | Output pin for the internal oscillator circuit | |
| 12 | I | RESET | Reset the MCU | |
| 13 | I | X1 | Used for a 32.768 kHz crystal for clock purposes | Not connected |
| 14 | O | X2 | Used for a 32.768 kHz crystal for clock purposes | Not connected |
| 15 | | GND | Connected to ground | 0 Volt |
| 16 | I/O | D0 | Input/output pin adressed by individual bits. | TX/RX switch in |
| 17 | I/O | D1 | Input/output pin adressed by individual bits. | Not connected |
| 18 | I/O | D2 | Input/output pin adressed by individual bits. | Not connected |
| 19 | I/O | D3 | Input/output pin adressed by individual bits. | Not connected |
| 20 | I/O | D4 | Input/output pin adressed by individual bits. | Not connected |
| 21 | I/O | D5 | Input/output pin adressed by individual bits. | Not connected |
| 22 | I/O | D6 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 23 | I/O | D7 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 24 | I/O | D8 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 25 | I/O | D9 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 26 | I | D10 | Input pin adressed by individual bits. | Mode SW: 1=Defalt 0=CEPT |
| 26 | I | STOPC | Input pin for transition from stop mode to active mode | |
| 27 | I | D11 | Input pin adressed by individual bits. | Stop |
| 27 | I | INT0 | Input pin for external interrupts | |
| 28 | I/O | R0-0 | Input/output pin adressable by individual bits | Mode select: 0=Defalt 1=Allways Internationell |
| 28 | I | INT1 | Input pin for external interrupts | |
| 29 | I/O | R0-1 | Input/output pin adressable by individual bits | Channel UP from rotary knob |
| 29 | I | INT2 | Input pin for external interrupts | |
| 30 | I/O | R0-2 | Input/output pin adressable by individual bits | Channel DOWN from rotary knob |
| 30 | I | INT3 | Input pin for external interrupts | |
| 31 | I/O | R0-3 | Input/output pin adressable by individual bits | |
| 31 | I | INT4 | Input pin for external interrupts | |
| 32 | I/O | R1-0 | Input/output pin adressable by individual bits | BEEP output |
| 32 | O | TOB | Timer output pin | |
| 33 | I/O | R1-1 | Input/output pin adressable by individual bits | GREEN lamp |
| 33 | O | TOC | Timer output pin | |
| 34 | I/O | R1-2 | Input/output pin adressable by individual bits | ORANGE lamp |
| 34 | O | TOD | Timer output pin | |
| 35 | I/O | R1-3 | Input/output pin adressable by individual bits | Not connected |
| 35 | I | EVNB | Event count input pin | Not connected |
| 36 | I/O | R2-0 | Input/output pin adressable by individual bits | Serial data output to EEPROM |
| 36 | I | EVND | Event count input pin | |
| 37 | I/O | R2-1 | Input/output pin adressable by individual bits | Serial data input from EEPROM |
| 37 | I/O | SCK | Serial interface clock input/output pin | |
| 38 | I/O | R2-2 | Input/output pin adressable by individual bits | Chip select to EEPROM |
| 38 | I | SI | Serial interface receive data input pin | |
| 39 | I/O | R2-3 | Input/output pin adressable by individual bits | Clock to EEPROM |
| 39 | O | SO | Serial interface transmit data output pin | |
| 40 | I/O | R3-0 | Input/output pin adressable by individual bits | |
| 41 | I/O | R3-1 | Input/output pin adressable by individual bits | Keyboard strobe output |
| 42 | I/O | R3-2 | Input/output pin adressable by individual bits | Keyboard strobe output |
| 43 | I/O | R3-3 | Input/output pin adressable by individual bits | Keyboard strobe output |
| 44 | I/O | R4-0 | Input/output pin adressable by individual bits | Keyboard strobe output |
| 45 | I/O | R4-1 | Input/output pin adressable by individual bits | |
| 46 | I/O | R4-2 | Input/output pin adressable by individual bits | Not connected |
| 47 | I/O | R4-3 | Input/output pin adressable by individual bits | Not connected |
| 48 | I/O | R5-0 | Input/output pin adressable by individual bits | Clock to PLL |
| 49 | I/O | R5-1 | Input/output pin adressable by individual bits | Data to PLL |
| 50 | I/O | R5-2 | Input/output pin adressable by individual bits | Chip select to PLL |
| 51 | I/O | R5-3 | Input/output pin adressable by individual bits | TX/RX output to analogboard |
| 52 | I/O | R6-0 | Input/output pin adressable by individual bits | Sqelsch input |
| 53 | I/O | R6-1 | Input/output pin adressable by individual bits | POWER switch (ON/OFF) |
| 54 | I/O | R6-2 | Input/output pin adressable by individual bits | High/Low power output |
| 55 | I/O | R6-3 | Input/output pin adressable by individual bits | Not connected |
| 56 | O | SEG | Segment signal pin for LCD | Not connected |
| 57 | O | SEG | Segment signal pin for LCD | Not connected |
| 58 | O | SEG | Segment signal pin for LCD | Not connected |
| 59 | O | SEG | Segment signal pin for LCD | Seg. 1 |
| 60 | O | SEG | Segment signal pin for LCD | Seg. 2 |
| 61 | O | SEG | Segment signal pin for LCD | Seg. 3 |
| 62 | O | SEG | Segment signal pin for LCD | Seg. 4 |
| 63 | O | SEG | Segment signal pin for LCD | Seg. 5 |
| 64 | O | SEG | Segment signal pin for LCD | Seg. 6 |
| 65 | O | SEG | Segment signal pin for LCD | Seg. 7 |
| 66 | O | SEG | Segment signal pin for LCD | Seg. 8 |
| 67 | O | SEG | Segment signal pin for LCD | Seg. 9 |
| 68 | O | SEG | Segment signal pin for LCD | Seg. 10 |
| 69 | O | SEG | Segment signal pin for LCD | Seg. 11 |
| 70 | O | SEG | Segment signal pin for LCD | Seg. 12 |
| 71 | O | SEG | Segment signal pin for LCD | Seg. 13 |
| 72 | O | SEG | Segment signal pin for LCD | Seg. 14 |
| 73 | O | SEG | Segment signal pin for LCD | Seg. 15 |
| 74 | O | SEG | Segment signal pin for LCD | Seg. 16 |
| 75 | O | SEG | Segment signal pin for LCD | Seg. 17 |
| 76 | O | SEG | Segment signal pin for LCD | Seg. 18 |
| 77 | O | SEG | Segment signal pin for LCD | Seg. 19 |
| 78 | O | SEG | Segment signal pin for LCD | Seg. 20 |
| 79 | O | SEG | Segment signal pin for LCD | Seg. 21 |
| 80 | O | SEG | Segment signal pin for LCD | Seg. 22 |
| 81 | O | SEG | Segment signal pin for LCD | Seg. 23 |
| 82 | O | SEG | Segment signal pin for LCD | Seg. 24 |
| 83 | O | SEG | Segment signal pin for LCD | Seg. 25 |
| 84 | O | SEG | Segment signal pin for LCD | Seg. 26 |
| 85 | O | SEG | Segment signal pin for LCD | Seg. 27 |
| 86 | O | SEG | Segment signal pin for LCD | Seg. 28 |
| 87 | O | SEG | Segment signal pin for LCD | Seg. 29 |
| 88 | O | SEG | Segment signal pin for LCD | Seg. 30 |
| 89 | O | SEG | Segment signal pin for LCD | Seg. 31 |
| 90 | O | SEG | Segment signal pin for LCD | Seg. 32 |
| 91 | O | SEG | Segment signal pin for LCD | Seg. 33 |
| 92 | O | COM1 | Common signal pin for LCD | Com.1 |
| 93 | O | COM2 | Common signal pin for LCD | Com. 2 |
| 94 | O | COM3 | Common signal pin for LCD | Com. 3 |
| 95 | O | COM4 | Common signal pin for LCD | Not connected |
| 96 | | V1 | Power pin for LCD driver. | |
| 97 | | V2 | Power pin for LCD driver. | Not connected |
| 98 | | V3 | Power pin for LCD driver. | Not connected |
| 99 | | Vcc | Applies power voltage | + 5 Volt |
| 100 | | NUMO | Non-user pin. Do not connect it to any lines | Not connected |