1. 8051 Single Board Computer (SBC) Version 1.0
By Wichit Sirichote

2. The 8051 Single Board Computer
Serial Interface
LED
Real-Time
Clock
Analog to digital
converter
Random Access
Memory (RAM)
Input/Output Pins
Input/Output Pins
Read Only Memory
(EEPROM)
DIP Switches
Liquid Cristal Display
8051 CPU
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3. 8051 SBC Features
CPU: compatible with 40-pin DIP MHz
MEMORY:
27C256: 32kB EPROM for monitor program
62256: 32KB SRAM for both code and data space
I/O:
direct CPU bus interface 2x16 line LCD
8-bit input port: 74LS244
8-bit output port: 74HC573
MEMORY and I/O Decoder: GAL16V8D
EEPROM: 24LC256: 32KB serial eeprom
Real-Time Clock (RTC): DS1307 with +3V Lithium backup
ADC: LTC1298, SPI interface 2-channel 12-bit Analog-to-Digital Converter
I/O pins: P1, P3 of 8051 CPU, 16-bit I/O port
Debug LED: single dot LED connected to P 1.7
Keypad and DIP Switch: 4-bit keypad and 4-bit DIP switch
RS 232 Level Converter: MAX232
RS 485: differential transceiver
Serial Interface: n1
Monitor Program: Modified PAULMON2 including new commands
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4. Hardware Schematic, CPU, memory, PLD
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5. RS232, RS485, DC supply, EEPROM, ADC, RTC, keypad, debug LED.
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6. Output Port 8-bit output port address: 0x0100 Data output pins
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7. Input Port
Data input pins
8-bit input port address: 0x0200
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8. 12-bit Analog to Digital Converter (ADC)
Transfer Curve
Output Code
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Source: Linear Technology LTC1298

9. 12-bit Analog to Digital Converter (ADC)
Analog input pin
Digital Data
output pin
Channel 0 (Pin 2) - Analog Input (e.g. from 0 to 5 volts)
Data (Pin 6) - The A/D conversion result is shifted out of pin 6
Data Transfer Format: serial with MSB first
Conversion Time : 60µs
Sampling Rate: 11.1 Kilo Samples per second (ksps)
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Source: Linear Technology LTC1298

10. 12-bit Analog to Digital Converter (ADC)
Handshake between computer and Converter
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11. 12-bit Analog to Digital Converter (ADC)
Handshake between computer and Converter
Transfer of data: from MSB (i.e. Bit 11) to LSB (i.e. Bit 0)
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12. MTK51 8051 Microcontroller Trainer
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13. MTK51 8051 Microcontroller Trainer
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14. MTK51 8051 Instruction Subset
ACALL - Absolute Call
ADD, ADDC - Add Accumulator (With Carry)
AJMP - Absolute Jump
ANL - Bitwise AND
CJNE - Compare and Jump if Not Equal
CLR - Clear Register
CPL - Complement Register
DA - Decimal Adjust
DEC - Decrement Register
DIV - Divide Accumulator by B
DJNZ - Decrement Register and Jump if Not Zero
INC - Increment Register
JB - Jump if Bit Set
JBC - Jump if Bit Set and Clear Bit
JC - Jump if Carry Set
JMP - Jump to Address
JNB - Jump if Bit Not Set
JNC - Jump if Carry Not Set
JNZ - Jump if Accumulator Not Zero
JZ - Jump if Accumulator Zero
LCALL - Long Call
LJMP - Long Jump
MOV - Move Memory
MOVC - Move Code Memory
MOVX - Move Extended Memory
MUL - Multiply Accumulator by B
NOP - No Operation
ORL - Bitwise OR
POP - Pop Value From Stack
PUSH - Push Value Onto Stack
RET - Return From Subroutine
RETI - Return From Interrupt
RL - Rotate Accumulator Left
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