8031 8032 8051 8052 CPU Tester
This CPU Tester automatic identifies and tests the MCS-51 family microcontrollers (8031 / 8032 / 8051 / 8052). It checks CPU type, internal/external RAM, stack and I/O ports.
CPU Identification
- Set jumper for 803x or 805x series
- Detects CPU type using Timer 2 functionality
- LED indicates detected CPU type
- Note: Some enhanced 8051 clones may be detected as 8052-class.
RAM Test
Internal RAM:
- Lower RAM (0x30–0x7F) tested on all CPUs
- Upper RAM (0x80–0xFF) tested only on 8032 / 8052
External RAM Test
- Tests external SRAM at 0x8000 – 0x9FFF (8k)
Normal Operation
- If all tests pass: Knight Rider LED sweep on Port 1
Failure LED patterns:
- Internal RAM error (128 byte) → LED7 flashes
- Internal RAM error (256 byte) → LED6 flashes
- External RAM error → LED5 flashes
Usage:
- Set jumper for 803X or 805X (This cannot be determined by code)
- Insert CPU into ZIF socket. Make sure orientation is correct.
- Apply Power via 5V USB Type B Cable. (Not included)
- Press Reset
- If the test completes successfully, Port1 LEDs sweep like Knight Rider; otherwise the CPU is faulty.
Test Sequence:
- CPU Detection
- Internal RAM Test
- External RAM Test
- LED displays on Port 1
