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EM73201BK Datasheet(PDF) 4 Page - ELAN Microelectronics Corp |
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EM73201BK Datasheet(HTML) 4 Page - ELAN Microelectronics Corp |
4 / 30 page 4 * This specification are subject to be changed without notice. 7.20.1999 EM73201 4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT Preliminary FUNCTION DESCRIPTIONS PROGRAM ROM ( 2K X 8 bits ) 2 K x 8 bits program ROM contains user's program and some fixed data . The basic structure of program ROM can be divided into 5 parts. 1. Address 000h: Reset start address. 2. Address 002h - 00Ch: 4 kinds of interrupt service rountine entry addresses . 3. Address 00Eh-086h : SCALL subroutine entry address, only available at 00Eh,016h,01Eh,026h, 02Eh, 036h, 03Eh, 046h, 04Eh, 056h, 05Eh, 066h, 06Eh, 076h ,07Eh, 086h . 4. Address 000h - 7FFh : LCALL subroutine entry address 5. Address 7E0h - 7FFh : The data region for 5-to-8 bits data conversion table . 6. Address 000h - 7FFh : Except used as above function, the other region can be used as user's program region. address 2048 x 8 bits 000h Reset start address 002h INT0; External interrupt service routine entry address 004h 006h TRGA, Timer/counterA interrupt service routine entry address 008h 00Ah TBI; Time base interrupt service routine entry address 00Ch INT1; External interrupt service routine entry address 00Eh 086h 7FFh User's program and fixed data are stored in the program ROM. User's program is according the PC value to send next executed instruction code. Fixed data can be read out by two ways. (1) Table-look-up instruction: Table-look-up instruction is depended on the Data Pointer ( DP ) to indicate to ROM address, then to get the ROM code data. LDAX Acc ← ← ← ← ← ROM[DP] L LDAXI Acc ← ← ← ← ← ROM[DP] H,DP+1 DP is a 12-bit data register which can store the program ROM address to be the pointer for the ROM code data. First, user load ROM address into DP by instruction "STADPL, STADPM, STADPH", then user can get the lower nibble of ROM code data by instruction "LDAX" and higher nibble by instruction "LDAXI". PROGRAM EXAMPLE: Read out the ROM code of address 777h by table-look-up instruction. LDIA #07h; STADPL ; [DP] L ← 07h STADPM ; [DP] M ← 07h STADPH ; [DP] H ← 07h, Load DP=777h : LDL #00h; LDH #03h; LDAX ; ACC ← 6h .. . .. . SCALL, subroutine call entry address |
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