GMS34004 Datasheet, PDF (18/105 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

CHAPTER 2. Architecture
Chapter 2. Architecture
BLOCK DESCRIPTION
Characteristics
The GMS340 series can incorporate maximum 1024 words (64 words ¡¿ 16
pages ¡¿ 8bits) for program memory. Program counter PC (A0~A5) and page
address register (A6~A9) are used to address the whole area of program
memory having an instruction (8bits) to be next executed.
The program memory consists of 64 words on each page, and thus each page
can hold up to 64 steps of instructions.
The program memory is composed as shown below.
Program capacity (pages)
01
8
2
3
4
5
6
7
Page 0
Page 1 Page 2
Page 15
63
0
A0~A5
Program counter (PC)
1
2
15
A6~A9
Page address register (PA)
6
(SR)
4
Stack register
(Level ¡È1¡È)
(Level ¡È2¡È)
(PRS) (Level ¡È3¡È)
Page buffer (PB)
Fig 2-1 Configuration of Program Memory
2- 1