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ATAR090X-YYY-TKSYZ Datasheet(PDF) 4 Page - ATMEL Corporation |
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ATAR090X-YYY-TKSYZ Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 75 page  4 ATAR090/ATAR890 4696D–4BMCU–12/04 Components of MARC4 Core The core contains ROM, RAM, ALU, program counter, RAM address registers, instruc- tion decoder and interrupt controller. The following sections describe each functional block in more detail. ROM The program memory (ROM) is mask programmed with the customer application pro- gram during fabrication of the microcontroller. The 2 Kbyte ROM size is addressed by a 12-bit wide program counter. An additional 1 Kbyte of ROM exists which is reserved for quality control self-test software The lowest user ROM address segment is taken up by a 512-byte zero page which contains predefined start addresses for interrupt service routines and special subroutines accessible with single byte instructions (SCALL). The corresponding memory map is shown in Figure 4 Look-up tables of constants can also be held in ROM and are accessed via the MARC4’s built-in table instruction. Figure 4. ROM Map RAM The ATAR090 and ATAR890 contain 256 x 4-bit wide static random access memory (RAM). It is used for the expression stack, the return stack and data memory for vari- ables and arrays. The RAM is addressed by any of the four 8-bit wide RAM address registers SP, RP, X and Y. Expression Stack The 4-bit wide expression stack is addressed with the expression stack pointer (SP). All arithmetic, I/O and memory reference operations take their operands from, and return their results to the expression stack. The MARC4 performs the operations with the top of stack items (TOS and TOS-1). The TOS register contains the top element of the expres- sion stack and works in the same way as an accumulator. This stack is also used for passing parameters between subroutines and as a scratch pad area for temporary stor- age of data. Return Stack The 12-bit wide return stack is addressed by the return stack pointer (RP). It is used for storing return addresses of subroutines, interrupt routines and for keeping loop index counts. The return stack can also be used as a temporary storage area. The MARC4 instruction set supports the exchange of data between the top elements of the expression stack and the return stack. The two stacks within the RAM have a user definable location and maximum depth. ROM (2 K x 8 bit) Zero page 7FFh 1FFh 000h 1F0h 1F8h 010h 018h 000 h 008h 020 h 1E8h 1E0h 140h 180h 040h 0C 0h 008h $A U T O SL E E P $R E SE T IN T 0 IN T 1 IN T 2 IN T 3 IN T 4 IN T 5 IN T 6 IN T 7 1E0h 1C 0h 100h 080h Zer o page 000h |
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