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ATAR890-C Datasheet(PDF) 4 Page - ATMEL Corporation |
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ATAR890-C Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 76 page  4 4700C–4BMCU–02/05 ATAR090-C/ATAR890-C 3.2 Components of MARC4 Core The core contains ROM, RAM, ALU, program counter, RAM address registers, instruction decoder and interrupt controller. The following sections describe each functional block in more detail. 3.2.1 ROM The program memory (ROM) is mask programmed with the customer application program dur- ing 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 acces- sible with single byte instructions (SCALL). The corresponding memory map is shown in Figure 3-2 Look-up tables of constants can also be held in ROM and are accessed via the MARC4’s built-in table instruction. Figure 3-2. ROM Map of ATAR090-C 3.2.2 RAM The ATAR090-C and ATAR890-C 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 variables and arrays. The RAM is addressed by any of the four 8-bit wide RAM address registers SP, RP, X and Y. 3.2.2.1 Expression Stack The 4-bit wide expression stack is addressed with the expression stack pointer (SP). All arith- metic, 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 expression stack and works in the same way as an accumulator. This stack is also used for passing parameters between subrou- tines and as a scratch pad area for temporary storage of data. ROM (2 K x 8 bit) Zero page 7FFh 1FFh 000h 1F0h 1F8h 010h 018h 000h 008h 020h 1E8h 1E0h 140h 180h 040h 0C0h 008h $AUTOSLEEP $RESET INT0 INT1 INT2 INT3 INT4 INT5 INT6 INT7 1E0h 1C0h 100h 080h page 000h Zero |
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