Sharp ER-A450T Service Manual - Page 11
Block diagram - serial
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D7 D6 D5 D4 D3 D2 D1 D0 P17 P16 P15 P14 P13 P12 P11 P10 Port 2 2) Block diagram Data bus Port 1 EXTAL XTAL X E MD2 MD1 MD0 RES STBY NMI AS RD HWR LWR RFSH VCC VCC VCC VSS VSS VSS VSS VSS VSS VSS VSS AVCC AVSS Clock Watch oscillator dog timer H8/500 CPU DTC Interruption controller Refresh controller Wait state controller A/D convertor 16bit free running timer x 2ch 8bit timer Serial communication interface x 2ch Port 8 Port 7 Port 6 Data bus (Lower) Data bus (Upper) Address bus Address bus Port 4 Port 3 P27/A23 P26/A22 P25/A21 P24/A20 P23/A19 P22/A18 P21/A17 P20/A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 P37 P36 P35 P34 P33 BREQ BACK WAIT P47 FTI2 P45 FTI1 P43 P42 P41/TMCI P40 Port 5 TXD2 RXD2 TXD1 RXD1 SCK2 IRQ2 IRQ1 IRQ0 P73 AN2 AN1 AN0 P67 P66 RS/P65 RR/P64 CD/P63 CS/P62 DR/P61 ER/P60 STOP/P57 P56 FMRS P54 P53 P52 P51 P50 Fig. 2-2 4 - 3
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