Sharp XE-A203 Service Manual - Page 11

4. USB PORT One port for USB Port (Slave) is provided as a standard provision. The Renesus-make USB general-use ASSP device M66291 is used. The M66291 is mapped to the /CS1 area 28000h-29FFFh. CPU A0 A1-A6 D0-D7 /CS1 /RD /WR /RESUSB /DREQUSB /INTUSB M66291 D15/AD0 AD1-AD6 D0-D7 CS RD D+ LWR D/RESET /Dreq0 VBuss TrON 1.5k 27 27 1.0uF 24MHz 1 3 Vbus D+ 2 D- 4 GND USB CONNECTOR No. CPU PORT Use signal Purpose 19 P83 (INT1) /DREQUSB USB DMA channel 0 DMA request signal 18 P84 (INT2) /INTUSB USB interruption 0 request signal 24 P76 (TA3OUT) /REUSB M66291 Reset control 5. SD CARD I/F (XE-A203U ONLY) One port for SD card I/F is provided as a standard provision. Communication with the SD card is made in the SPI mode. No. CPU PORT Use signal Purpose 31 P67 (TXD1) /SD_WP SD card write protect detection signal 32 P66 (RXD1) /SD_CD SD card insertion detection signal 33 P65 (CLK1) /SD_CS SD card chip select signal 34 P64 (CLKS1) /SD_POW SD card power on signal 35 P63 (TXD0) SD_TXD TxD signal 36 P62 (RXD0) SD_RXD RxD signal 37 P61 (CLK0) SD_CLK Serial CLK signal 6. PRINTER CONTROL 6-1. STEPPING MOTOR CONTROL The two-phase bi-polar stepping motor is driven at a constant voltage. 1step : 0.087mm, 1dot : 2step Pin No. CPU PORT Use signal Function 76 P14 IN2 Paper feed motor (IN2) 75 P15 IN1 Paper feed motor (IN1) 74 P16 ENA2 Paper feed motor (ENA2) 73 P17 ENA1 Paper feed motor (ENA1) Driver IC input (CPU output) Motor drive signal STEP IN1 IN2 ENA1 ENA2 A (OUT1) B (OUT3) /A (OUT2) /B (OUT4) 1 L L H H H H L L 2 H L H H L H H L 3 H H H H L L H H 4 L HH H H L L H 6-2. HEAD CONTROL HEAD : All 288dot, Width 0.167mm/dot (6dot/mm) Pin No. CPU PORT Use signal Function 89 P107 STRB1# Printer STB1# 94 P102 STRB2# Printer STB2# 30 P70 DAT Printer print data 28 P72 PCLK Printer forwarding clock 90 P106 LATCH# Printer data latch 91 P105 VPON Printer head motor power 6-3. PAPER TAKE UP MOTOR CONTROL Pin No. PORT Use signal Function 21 P81 MOTOR Printer paper take up motor 6-4. OUT OF PAPER DETECTION Pin No. PORT Strobe signal Function 6 P91 /S4 Printer out of paper detection (It reads according to the timing of /S4) 6-5. PLATEN OPEN (HEAD UP DETECTION) Pin No. PORT Strobe signal Function 6 P91 /S3 Platen open detection (It reads according to the timing of /S3) 7. A/D CONVERSION The following three signals are inputted to the A/D conversion port. PIN No. PORT Use signal Function 97 AN0/P100 TM Printer head temperature monitor 95 AN1/P101 VPTEST Printer head voltage monitor 93 AN3/P103 VBAT Battery voltage monitor XE-A203U/XE-A203A HARDWARE DESCRIPTION - 9 -