DMC73C167 datasheet(16/90 Pages) DAEWOO

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8Bit Single Chip Microcontroller

DMC73C167

4. ARCHITECTURE

4.1 Overview

The DMC73C167 has a maximum memory address space of 16 kbytes on-chip ROM and

only a single-chip mode. On-chip memory spaces are configured as shown if Figure 4-1

below. In the section that follow, the register file(RF) and the peripheral file(PF) are described

along with three important registers in the CPU : the stack pointer(SP), the status register

(ST), and the program counter(PC).

Figure 4-1. DMC73C167 Memory Maps

Memory address

0000h

00FFh

0100h

Peripheral File (PF)

01FFh

0200h

Not Available

C005h

C006h

16Kbytes ROM

FFFFh

4.2 Register File (RF)

The 256-byte on-chip RAM resides in locations 0000h to 00FFh of the DMC73C167's

address space and is called the register file (RF). The RAM is treated as a register by much

of the instruction set and is numbered R0-R255. The first two registers, R0 and R1, are also

called the A and B registers, respectively. Several instructions specify A or B as either the

source or destination register. For example, STSP stores the contents of the stack pointer

(SP) in the B register. Except where stated otherwise, any register in the register file can be

addressed as an 8-bit source or destination register. The stack is also located in the register

file. Refer to Section 4.4 for information regarding the initialization of the stack pointer and

stack definition in the register file.

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