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| 312 Decoder (10+2 - Corresponds to HT6010/HT6012) 312 Decoder (10+2 - Corresponds to HT6010/HT6012) D/N: HA0064E Introduction This application shows how to use the HT48R50A-1 to simulate the HT6032 3 12 decoder function to decode the 10 Address bits and 2 Data bits for the HT6010/HT6012. Function and Theory The 3 Decoder function can decode the 10 Address bits and 2 Data bits each of which can be set individually to either 1 and 0. MCU: HT48R50A-1 Method: uses the HT6032 decoding process (see the HT6032 datasheet) to check the corresponding signal width to judge if the signal is either a 0, 1 or floating. The corresponding width can decode skewed signals, the tolerance of which can be adjusted by MAXDURATION in the program. Pin Function: PB0~PB7: Address input pins PC0~PC1: Address input pins PD2~PD3: Data output pins PA5: Serial data input pin PD4: Valid transmission pin 1 12 312 Decoder (10+2 - Corresponds to HT6010/HT6012) Software IP: 3 _10+2 Decoder Subroutine Usage Description Table IP Name (Label) 12 12 System Resources Functional Description Decode 12 bits of information from the 3 Encoder HT48R50A-1 213 15 Bytes: HI_COUNTLO_COUNT HI_COUNT_SAVE LO_COUNT_SAVEBITCOUNTER DATARESADD_RES2 ADD_RES1ADD_RES0 WORDCNTVTCOUNT1 VTCOUNT0DECODER_CODE[2] DECODER_CODE[1] DECODER_CODE[0] 5 Bits: DECODER_ENDECODER_FLAG DECODER_STATUSMATCHBIT VTBIT 12 3 _10+2D Function MCU ROM RAM Stack Subroutine/Macro I/O lines 1 level used Subroutine 14 I/O lines PB0~PB7: input pins(I/O), non-pull high PC0~PC1: input pins(I/O), non-pull high PD2~PD4: output pin(I/O), pull high PA5: input pin(I/O), pull high 8MHz RC TMR INTERUPT Set address pins CALL DECODER_INITIAL fSYS Other MCU resources User interface 2 312 Decoder (10+2 - Corresponds to HT6010/HT6012) Program Flowchart A INITIAL N N DECODER_STATUS= 1? Y HI_COUNT Increase 1 VTCOUNT1 Decrease 1 N N Match with receives ? Y Read 10-bit address VTCOUNT1=0? Y N VTCOUNT0=0? Y Clear VT pin Z= 1? Y LO_COUNT Decrease 1 WORDCNT=0? N MATCHBIT=0? Y Clear VTBIT Return to Main VTCOUNT1=E3H Set DECODER_STATUS N WORDCNT=1? Y Set MATCHBIT VTCOUNT0 Decrease 1 Move HI_COUNT to HI_COUNT_SAVE Y N Y LO_COUNT Increase 1 N Y LO_COUNT Decrease 1 Set C Return to Main RRC DECODER_CODE[2] Set VT and VTBIT Return to Main Clear DECODER_STATUS RRC DECODER_CODE[1] Move LO_COUNT to LO_COUNT_SAVE RRC DECODER_CODE[0] BITCOUNTER Decrease 1 Clear LO_COUNT N BITCOUNTER=0? HI_COUNT_SAVE< MAXDURATION? N B BITCOUNTER=12 Y Clear DECODER_CODE[0],DE CODER_CODE[1] Move DECODER_CODE[1] to DATARES Y Return to Main N Y Clear DECODER_FLAG, MATCHBIT Clear LO_COUNT_SAVE and HI_COUNT_SAVE Return to Main WORDCNT=3? Return to Main WORDCNT Decrease 1 A 3 Z=1? DECODER_STATUS= 0 DECODERPIN=0 N N LO_COUNT_SAVE< MAXDURATION? Y Return to Main B N HI_COUNT_SAVE >LO_COUNT_SAVE Y Clear C Set DECODER_FLAG Output data to data pins VTCOUNT1=E3H VTCOUNT0=06H ' Y N 312 Decoder (10+2 - Corresponds to HT6010/HT6012) Program Description Refer to the ASM file that contains one main program code file for users to follow and add their own programs. Users need to add the INCLUDE 10+2.ASM and MAIN.ASM files to their project. The ASM text file include the DEFINE.ASM, INTERUPT.ASM, STDUC.ASM, MEMORY.ASM and MACRO.ASM files that should be added in the project. 4 |
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