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HT93LC46 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT93LC46 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 10 page  Timing Diagrams Functional Description The HT93LC46 is accessed via a three-wire serial communication interface. The device is arranged into 64 words by 16 bits or 128 words by 8 bits depending whether the ORG pin is connected to VCC or VSS. The HT93LC46 contains seven in- structions: READ, ERASE, WRITE, EWEN, EWDS, ERAL and WRAL. When the user se- lectable internal organization is arranged into 64 ×16 (128×8), these instructions are all made up of 9(10) bits data: 1 start bit, 2 op code bits and 6(7) address bits. By using the control signal CS, SK and data input signal DI, these instructions can be given to the HT93LC46. These serial instruction data presented at the DI input will be written into the device at the rising edge of SK. During the READ cycle, DO pin acts as the data output and during the WRITE or ERASE cycle, DO pin indicates the BUSY/READY status. When the DO pin is active fo r read data or as a BUSY/READY indicator the CS pin must be high; otherwise DO pin will be in a high-imped- ance state. For successful instructions, CS must be low once after the instruction is sent. After power on, the device is by default in the EWDS state. And, an EWEN instruction must be per- formed before any ERASE or WRITE instruc- tion can be executed. The following are the functional descriptions and timing diagrams of all seven instructions. READ The READ instruction will stream out data at a specified address on the DO pin. The data on DO pin changes during the low-to-high edge of SK signal. The 8 bits or 16 bits data stream is preceded by a logical “0” dummy bit. Irrespec- tive of the condition of the EWEN or EWDS instruction, the READ command is always valid and independent of these two instruc- tions. After the data word has been read the internal address will be automatically incre- mented by 1 allowing the next consecutive data word to be read out without entering further address data. The address will wrap around with CS High until CS returns to LOW. EWEN/EWDS The EWEN/EWDS instruction will enable or disable the programming capabilities. At both the power on and power off state the device auto- matically entered the disable mode. Before a WRITE, ERASE, WRAL or ERAL instruction is given, the programming enable instruction EWEN must be issued, otherwise the ERASE/WRITE instruction is invalid. After the EWEN instruction is issued, the programming enable condition remains until power is turned off or a EWDS instruction is given. No data can be written into the device in the programming dis- abled state. By so doing, the internal memory data can be protected. HT93LC46 5 6th May ’99 |
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