Sharp FO-375, Руководство по обслуживанию

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UX-108U/178U/188U
FO-375U
XFC3 (IC3) Terminal descriptions
CPU Control Interface
MIRQn 135 I HU
−
Modem interrupt, active low. (Hysteresis In, Internal Pullup.)
SYSCLK 133 I H
−
System clock. (Hysteresis In.)
TSTCLK 130 O
−
123XT Test clock.
Bus Control Interface
A[23:0] [1:6][8:13] O TU 123XT Address bus (24-bit).
[15:20][22:27]
D[7:0] [136:139] I/O TU 123XT Data bus (8-bit).
[141:144]
RDn 128 O
−
123XT Read strobe.
WRn 127 O
−
123XT Write strobe.
ROMCSn 120 O
−
123XT ROM chip select.
CS1n 122 O
−
123XT I/O chip select.
CS0n 57 O
−
123XT SRAM chip select. (Battery powered.)
MCSn 121 O
−
123XT Modem chip select.
SYNC 126 O
−
123XT Indicates CPU op code fetch cycle (active high).
REGDMA 124 O
−
123XT Indicates REGSEL cycle and DMA cycle.
WAITn 125 O
−
123XT Indicates current TSTCLK cycle is a wait state or a halt state.
RASn 113 O
−
123XT DRAM row address select. (Battery powered.)
CAS[1:0]n [111:112] O
−
123XT DRAM column address select. (Battery powered.)
DWRn 109 O
−
123XT DRAM write. (Battery powered.)
Prime Power Reset Logic and Test
DEBUGn 129 I HU
−
External non-maskable input (NMI).
RESETn 131 I/O HU 2XO XFC3 Reset.
TEST 58 I C
−
Sets Test mode (Battery powered).
Battery Power Control and Reset Logic
XIN 59 I OSC
−
Crystal oscillator input pin.
XOUT 60 O
−
OSC Crystal oscillator output pin.
PWRDWNn 62 I H
−
Used by external system to indicate loss of power to XFC3. (Results in NMI)
BATRSTn 61 I H
−
Battery power reset input.
WRPROTn 110 O
−
1XC (Battery powered.) Write protect during loss of VDD power.
Scanner Interface
START 101 O
−
2XS Scanner shift gate control.
CLK1 100 O
−
2XS Scanner clock.
CLK1n 99 O
−
2XS Scanner clock-inverted.
CLK2 98 O
−
2XS Scanner reset gate control (or clock for CIS scanner).
FCS1n/VIDCTL0 96 O
−
2XT Flash memory chip select or Video Control signal.
FCS2n/VIDCTL1 97 O
−
2XT Flash memory chip select or Video Control signal.
Printer Interface
PCLK 29 O
−
3XC Thermal Print Head (TPH) clock, or external DMAACK.
PDAT 30 O
−
2XP Serial printing data (to TPH).
PLAT 31 O
−
3XP TPH data latch.
STRB[3:0] [33:36] O
−
1XP Strobe signals for the TPH.
STRBPOL 37 I C
−
Sets strobe polarity, active high/low.
Operator Panel Interface
OPO[0]/GPO[8]/ 47 O
−
2XL Keyboard/LED strobe [0] or GPO[8] or Scan Motor Power Control
SMPWRCTRL
OPO[1]/GPO[9]/
46 O
−
2XL Keyboard/LED strobe [1] or GPO[9] or Print Motor Power Control
PMPWRCTRL
OPO[2]/GPO[10]/
44 O
−
2XCT Keyboard/LED strobe [2] or GPO[10] or RINGER
RINGER
OPO[3]/GPO[11]
43 O
−
2XL Keyboard/LED strobe [3] or GPO[11]
OPO[4]/GPO[12]/ 42 O
−
2XL Keyboard/LED strobe [4] or GPO[12] or SSTXD1 (for SSIF1)
SSTXD1
OPO[5]/GPO[13]
40 O
−
2XL Keyboard/LED strobe [5] or GPO[13]
OPO[6]/GPO[14] 39 O
−
2XL Keyboard/LED strobe [6] or GPO[14]
OPO[7]/GPO[15] 38 O
−
2XL Keyboard/LED strobe [7] or GPO[15]
OPI[0]/GPIO[21]/ 52 I/O HU 2XC (Pullup, Hysteresis In) Keyboard return [0] or GPIO[21] or SSRXD1
SSRXD1 (for SSIF1)
OPI[1]/GPIO[22]/ 51 I/O HU 2XC (Pullup, Hysteresis In) Keyboard return [1] or GPIO[22] or SSSTAT1
SSSTAT1 (for SSIF1)
OPI[2]/GPIO[23]/ 50 I/O HU 2XC (Pullup, Hysteresis In) Keyboard return [2] or GPIO[23] or SSCLK1
SSCLK1 (for SSIF1)
Pin Name Pin No. I/O
Input Output Pin Description
Type Type (Note: Active low signals have an "n" pin name ending.)
5 – 3