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EM78P813BQ Datasheet(PDF) 12 Page - ELAN Microelectronics Corp |
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EM78P813BQ Datasheet(HTML) 12 Page - ELAN Microelectronics Corp |
12 / 65 page EM78P813 8-bit OTP Micro-controller __________________________________________________________________________________________________________________________________________________________________ * This specification is subject to change without notice. 12 2004/8/19 (V1.6) 64K Program ROM Unused 256K byte Data ROM EM78P813 (EXSEL pin pull high) MAX 2M Byte Expand ROM (FLASH ROM) 128K word Program ROM (PAGE0~PAGE127) ExpandData ROM Expand Data ROM start address 0 X X X X X X X X X X X X X X X X X 0 0 RF PAGE1 RF PAGE2 0 ROM Address 0 ROM Address 9 ROM Address 17 b0 b0 b7 b7 IOCB B7 Fig5(b) : EXSEL = 1, only external program are used. How to set start address for expanding Data ROM? EM78815 support maximum 2M Byte expanding data memory, but user must fix the start address of external program at 0x00000 and set start address of expanding Data ROM by user. By this way, MCU will get data from external memory if the data ROM is over 256K. The width of an instruction is 13 bit and the data bus for external memory is 8bit, so an instruction will captured two address size and the LSB address of start address at external ROM will be 0. Besides, EM78815 only support MAX 128K program, so the start address of Data ROM will smaller than 256K-2 andA20, A19 and A18 will be 0 also. User only has to according to write Data ROM address A17~A1 to IOCB PAGE2 bi7,RF PAGE3 and RF PAGE2. EM78P813 writer pin OTP writer PIN NAME MASK ROM PIN NAME P.S. 1.VDD VDD,AVDD 2.VPP /RESET 3.DINCK P77 4.ACLK P76 5.PGM P75 6.OE P74 7.DATA P73 8.GND VSS,AVSS,TEST 9.ROMSEL P72 High : Data ROM Low : Program ROM |
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