ST2202 datasheet(11/65 Pages) ETC

Nome de Peças	ST2202

Descrição Electrónicos	8 BIT Integrated Microcontroller with 256K Bytes ROM

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Fabricante Electrônico	ETC [List of Unclassifed Manufacturers]

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11 / 65 page

Sitronix

ST2202

Ver 2.0a

11/65

2003-May-05

7.4 RAM

Internal static RAM can be divided into 3 parts in function. First

is the zero page memory, second is for stack, and third can be

used as LCD frame buffer or for general purpose.

Zero Page Data RAM ($0080~$00FF)

Total 128 bytes of data RAM in zero page is very useful for

programmers. They provide short instruction codes and cycles.

Use zero page addressing mode on the variables in this area

usually speeds up the overall performance.

Stack RAM ($0100~$01FF)

The ST2202 has 256 bytes stack from $0100 to $01FF. It

provides a maximum of 128 levels for subroutines. By setting

stack pointer carefully, stack memory can also be used as data

memory.

User Memory and LCD Frame Buffer

($0200~$0FFF)

The ST2202 shares memory for both user memory and LCD

frame buffer. The range of LCD frame buffer will be fixed after

initialization of LCD control registers. Memory beyond is user

memory. Read and write operations can be applied to LCD

frame buffer to maintain display content, and almost none of

the CPU time is affected. This is contributed by one special

memory transfer technique of display data from LCD frame

buffer to the LCD controller.

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