S3C72B5 datasheet(4/37 Pages) SAMSUNG | The S3C72B5/C72B7/C72B9 single-chip CMOS microcontroller has been designed for high performance using Samsungs newest 4-bit CPU core, SAM47 (Samsung A

4 page

PRODUCT OVERVIEW

S3C72B5/C72B7/C72B9/P72B9

1-4

DATA MEMORY

Overview

The 3,584-bit data memory has five areas:

— 32

× 4-bit working register area

— 224

× 4-bit general-purpose area in bank 0 which is also used as the stack area

— 256

× 4-bit general-purpose area in bank 1, bank 2,……, bank 13, respectively

— 256

× 5-bit area for LCD data in bank 14

— 128

× 4-bit area in bank 15 for memory-mapped I/O addresses

The data memory area is also organized as sixteen memory banks — bank 0, bank 1, ….., and bank 15. You use

the select memory bank instruction (SMB) to select one of the banks as working data memory.

Data stored in RAM locations are 1-, 4-, and 8-bit addressable. After a hardware reset, data memory initialization

values must be defined by program 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 logical zero, only locations 00H–7FH of bank 0 and bank 15 can be accessed. When the

EMB flag is set to logical one, all sixteen data memory banks can be accessed based on the current SMB value.

Working Registers

The RAM's working register area in data memory bank 0 is also divided into four register banks. Each register

bank has eight 4-bit registers. Paired 4-bit registers are 8-bit addressable.

registers WX, WL and HL are used as address pointers for indirect addressing.

To limit the possibility of data corruption due to incorrect register addressing, it is advisable to use bank 0 for

main programs and banks 1, 2, and 3 for interrupt service routines.

LCD Data Register Area

Bit values for LCD segment data are stored in data memory bank 14. Register locations that are not used to store

LCD data can be assigned to general-purpose use.

Bit Sequential Carrier

The bit sequential carrier (BSC) is a 16-bit general register that you can manipulate using 1-, 4-, and 8-bit RAM

control instructions.

Using the BSC register, addresses and bit locations can be specified sequentially using 1-bit indirect addressing

instructions. In this way, a program can generate 16-bit data output by moving the bit location sequentially,

incrementing or decrementing the value of the L register. You can also use direct addressing to manipulate data

in the BSC.

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