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KS57C01502 Datasheet(PDF) 4 Page - Samsung semiconductor

Part No. KS57C01502
Description  The KS57C01502/C01504 single-chip CMOS microcontroller has been designed for high-performance using Samsungs newest 4-bit CPU core, SAM47 (Samsung Arr
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Maker  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KS57C01502 Datasheet(HTML) 4 Page - Samsung semiconductor

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PRODUCT OVERVIEW
KS57C01502/C01504/P01504
1-4
DATA MEMORY
Overview
Data memory is organized into three areas:
— 32
× 4-bit working registers
— 224
× 4-bit general-purpose area in bank 0
— 256
× 4-bit general-purpose area in bank 1
— 128
× 4-bit area in bank 15 for memory-mapped I/O addresses
Data stored in data memory can be manipulated by 1-, 4-, and 8-bit instructions.
Data memory is organized into two memory banks — bank 0, bank 1 and bank 15. The select memory bank in-
struction (SMB) selects the bank to be used as working data memory. After power-on reset operation, initialization
values for data memory must be redefined by code.
Data Memory Addressing Modes
The enable memory bank (EMB) flag controls the addressing mode for data memory banks 0, 1 or 15.
When the EMB flag is logic zero, restricted area can be accessed. When the EMB flag is set to logic one, all two
data memory banks can be accessed according to the current SMB value. The EMB = "0" addressing mode is
used for normal program execution, whereas the EMB = "1" mode is commonly used for interrupts, subroutines,
mapped I/O, and repetitive access of specific RAM addresses.
Working Registers
The RAM's working register area in data memory bank 0 is further divided into four register banks. Each register
bank has eight 4-bit registers that are addressable either by 1-bit or 4-bit instructions. Paired 4-bit registers can be
addressed as double registers by 8-bit instructions.
Register A is the 4-bit accumulator and double register EA is the 8-bit extended accumulator. Double registers
WX, WL, and HL are used as data pointers for indirect addressing. Unused working registers can be used as
general-purpose memory.
To limit the possibility of data corruption due to incorrect register bank addressing, register bank 0 is usually used
for the main program and banks 1, 2, and 3 for interrupt service routines.


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