Daewoo DTD-25G1 ME, Service Manual

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IC DESCRIPTION
SDA-55XX ( Micro-controller & Teletext Decoder)
Feature
General
• Feature selection via special function register
• Simultaneous reception of TTX, VPS, PDC, and
WSS (line 23)
• Supply Voltage 2.5 and 3.3V
• ROM version package P-SDIP 52, P-MQFP64
• Romless version package P-MQFP100, P-LCC84
External Crystal and Programmable clock speed
• Single external 6MHz crystal, all necessary clocks
are generated internally
• CPU clock speed selectable via special function
registers.
• Normal Mode 33.33 Mhz CPU clock, Power Save
mode 8.33 Mhz
Microcontroller Features
• 8bit 8051 instruction set compatible CPU.
• 33.33-MHz internal clock (max.)
• 0.360 s(min.) instruction cycle
• Two 16-bit timers
• Watchdog timer
• Capture compare timer for infrared remote control decoding
• Pulse width modulation unit (2 channels 14 bit, 6 channels 8 bit)
• ADC (4 channels, 8 bit)
• UART
Memory
• Non-multiplexed 8-bit data and 16 ... 20-bit address bus (ROMIess Version)
• Memory banking up to 1Mbyte (Romless version)
• Up to 128 Kilobyte on Chip Program ROM
• Eight 16-bit data pointer registers (DPTR)
• 256-bytes on-chip Processor lnternal RAM (IRAM)
• 128 bytes extended stack memory.
• Display RAM and TXT/VPS/PDC/WSS-Acquisition-Buffer directly accessible via MOVX
• UP to 16KByte on Chip Extended RAM(XRAM) consisting of ;
- 1 Kilobyte on-chip ACQ-buffer-RAM (access via MOVX)
- 1 Kilobyte on-chip extended-RAM (XRAM, access via MOVX) for user software
- 3 Kilobyte Display Memory
P-SDIP-52
P-MQFP-64
APPENDIX