Sharp 32LF-94EC Service Manual page 48

AD Converters for Display Functions
• 3x Sigma Delta ADC for Black Current, EHT, Beam Current Limiting measurement Clock frequency
54MHz
Deflection & Geometry
• Horizontal time base for display based on digital PLL
• Very good jitter performance of about. +/- 300 ps of the horizontal drive pulse
• Low power start-up mode from standby
• Slow start/stop
• Fixed beam-current switch-off
• Vertical and horizontal geometry processing. Special features of the horizontal geometry processor
are:
– inner-pincushion correction
– horizontal non-linearity correction
• Auxiliary output
– can be used to generate waveform with frequency of vertical deflection (for example quadrupole
correction for flat picture tubes)
• Vertical guard input
• Flash detection input
• EHT overvoltage protection (X-Ray) input
• Horizontal drive output
Microprocessor
• TV control by embedded 32 bit RISC processor
– Philips MIPS PR1910, 54MHz
• Cache Structure
– Unified 8Kbyte Instruction/Data Cache
• Co-Processor:
– 2x 32bit system clock Count/Compare (Timer1,2) Registers
– 1x 32bit system clock Count/Compare (Timer3) configurable as Watchdog Timer
• Debug Support:
– MIPS JTAG compliant
– Software / Hardware Breakpoint
– Single Stepping
– Real Time Trace
TV Control Peripherals
• General Purpose IO (GPIO):
– 32 total GPIO pins, 28 with secondary functions stated bellow (4 GPIO free pins)
• Two I 2 C Interface units
• Two General Purpose Counter/Compare (Timer) units
• Universal Asynchronous Receiver Transmitter (UART)
• Eight external interrupts
• Analogue to Digital converter:
– 6 multiplexed inputs
– Programmable resolution of up to 10 bits
• Remote Control Receiver and Transmitter
Reset
• Reset via external input
Internal Memory for SW Code /Data
• Data/ Code memory up to 128 Kbytes (SRAM)
Memory at SDRAM Interface
• Addressable space up to 32Mbyte (SDRAM only, no SRAM, no DDRAM)
– 16Mbit (1M x 16) Single data rate SDRAM
• Memory Functions:
– PIP/DW, DNR, Scan Conversion, requiring at least 13Mbit
– PIP replay, scalable size
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AK53 D.O.C. Service Manual 22/03/2004