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PD16435 数据表(PDF) 6 Page - Renesas Technology Corp |
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PD16435 数据表(HTML) 6 Page - Renesas Technology Corp |
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6 / 38 page  µPD16435, 16435A 4 PIN DESCRIPTIONS Description Chip select signal Register selection signal (specifies address register when “0”, control register when “1”). Read enable signal. Reads write address when scrolling. Active edge is falling edge. Write enable signal. Active edge is falling edge. Word length selection signal (4-bit input when “1”, 8-bit input when “0”). Transmit/receive data (3-state bidirectional) Upper → D4 to D7 Lower → D0 to D3 (These pins should be set as unused in case of 4-bit data). In test mode, these pins are output pins. In a 4-bit transfer, storage is performed in the upper (MSB) in order from the data transferred first. “0” indicates busy state. “0” → Initialization of all internal registers and commands is performed. Output is fixed at V1. Signal is output to CPU on completion of one-character scroll. Synchronization signal input/output pins for master/slave operation. µPD16435: Input the 4.19 MHz reference clock to the OSC1 pin externally. Leave the OSC2 pin open. (Always outputs high level.) µPD16435A: This is the pin to which the 4.19 MHz crystal resonator is connected. Input the external clock to OSC1 first. 2 Hz external clock input pin. Scaled by 2 internally to generate 1 Hz, used as blink synchronization signal. Common output signals Segment output signals “1” → Test mode “0” or open → Normal operating mode Output Type ––– ––– ––– ––– ––– CMOS 3-state Nch open-drain ––– CMOS Nch open-drain ––– ––– Analog switch Analog switch ––– Input/Output Input Input Input (Schmitt) Input (Schmitt) Input Input/output Output Input Output Input/output ––– Input (Schmitt) Output Output Output Pin Name Pin No. CS 255 RS 254 RD 253 WR 252 WS 251 250 D0 to D7 to 243 BUSY 240 RESET 242 SCR 241 SYNC 239 OSC1 235 OSC2 234 OSC3 233 COM1 to 212 to 176 COM73 3 to 38 SEG1 to 41 to 70 SEG119 81 to 134 137 to 171 TEST1 238 TEST2 237 |
类似零件编号 - PD16435_15 |
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类似说明 - PD16435_15 |
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