Daewoo DTR-14D3VG, Service Manual

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• Microcontroller
- 8 bit C500-CPU (8051 compatible)
- 18 MHz internal clock
- 0.33 µs instruction cycle
- Eight 16-bit data pointer registers (DPTR)
- Two 16-bit timers
- Watchdog timer
- Capture comprare timer for infrared remote control decoding
- Serial interface (UART)
- 256 bytes on-chip RAM
- 8 Kbyte on-chip on-chip display-RAM (access via MOVX) for SDA 5250, SDA 5254 and SDA 5252
- 1 Kbyte on-chip display-RAM (access via MOVX) for SDA 5250, SDA 5254 and SDA 5255
- 1 Kbyte on-chip TVT/VPS-Acquisition-buffer-RAM (access via MOVX)
- 1 Kbyte on-chip extended-RAM (access via MOVX) for SDA 5250, SDA 5254 and SDA 5255
- 6 channel 8-bit pulse width modulation unit
- 2 channel 14-bit pulse width modulation unit
- 4 multiplexed ADC inputs with 8-bit resolution
- One 8-bit I/O port with open drain output and optional I
2 C-Bus emulation (PORT 0)
- Two 8-bit multifunctional I/O ports (PORT 1, PORT3)
- One 4-bit port working as digital or analog inputs (PORT 2)
- One 2-bit I/O port with optional function
- One 3-bit I/O port with optional RAM/ROM address expansion up to 512 Kbyte (ROMIess-Version)
• P-SDIP-52-1 package or P-MQFP-64-1 for ROM-Versions (SDA 5251, SDA 5252, SDA 5254, SDA 5255)
• P-MQFP-80-1 Package for ROMIess-Version (SDA 5250 M)
• P-LCC-84-2 Package for Emulator-Version (SDA 5250)
• 5 V Supply Voltage
(3) Block Diagram