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EM73A89B Datasheet(PDF) 5 Page - ELAN Microelectronics Corp |
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EM73A89B Datasheet(HTML) 5 Page - ELAN Microelectronics Corp |
5 / 58 page 5 * This specification are subject to be changed without notice. EM73A89B 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT 8.16.2001 Preliminary User's program and fixed data are stored in the program ROM. User's program is executed using the PC value to fetch an instruction code. The 16Kx8 bits program ROM can be divided into 4 banks. There are 4Kx8 bits per bank. The program ROM bank is selected by P3(1..0). The program counter is a 13-bit binary counter. The PC and P3 are initialized to "0" during reset. When P3(1..0)=00B or 11B, the bank0 and bank1 of program ROM will be selected. P3(1..0)=01B, the bank0 and bank2 will be selected. P3(1..0)=10B, the bank0 and bank3 will be selected. P3=xx00B Address P3=xx11B P3=xx01B P3=xx10B 0000h : : Bank0 Bank0 Bank0 0FFFh 1000h : : Bank1 Bank2 Bank3 1FFFh PROGRAM EXAMPLE: BANK 0 START: : : : LDIA #00H ; set program ROM to bank1 OUTA P3 B XA1 : XA : : : LDIA #01H ; set program ROM to bank2 OUTA P3 B XB1 : XB : : : LDIA #02H ; set program ROM to bank3 OUTA P3 B XC1 : XC : : : BXD XD : : : : ; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - BANK 1 XA1 : : : BXA : XA2 : : |
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