KS57P0504 datasheet(35/282 Pages) SAMSUNG

Part #	KS57P0504

Description	The KS57P0504 is the microcontroller which has 4 Kbyte one-time-programmable ROM and the functions are the same to KS57C0502/C0504

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Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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KS57C0502/C0504/P0504 MICROCONTROLLER

ADDRESSING MODES

3–1

3 ADDRESSING MODES

OVERVIEW

The enable memory bank flag, EMB, controls the two addressing modes for data memory. When you enable

the EMB flag, you can address the entire RAM area. When you clear the EMB flag to logic zero, the addressable

RAM is restricted to specific areas.

The EMB flag works in connection with the select memory bank instruction, SMB n. You will recall that the

SMB n instruction is used to select RAM bank 0, bank 1 or 15. The SMB setting is always contained in the upper

four bits of a 12-bit RAM address. For this reason, both addressing modes (EMB = "0" and EMB = "1") apply

specifically to the memory bank indicated by the SMB instruction, and any restrictions to the addressable area

within banks 0, 1 or 15. Direct and indirect 1-bit, 4-bit, and 8-bit addressing methods can be used.

In addition, there are several RAM locations that can always be addressed using specific addressing methods,

regardless of the current EMB flag setting.

Here are a few things to remember about addressing data memory areas:

— When you address peripheral hardware locations in bank 15, you can use the mnemonic for the memory-

mapped hardware component as the operand in place of the actual address location.

— Always use an even-numbered RAM address as the operand in 8-bit direct and indirect addressing.

— With direct addressing, use the RAM address as the instruction operand; with indirect addressing, the

insttruction specifies a register which contains the operand's address.

Similar Part No. - KS57P0504

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