GMS36 Datasheet, PDF (34/109 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 4. FUNCTIONAL DESCRIPTION
4. FUNCTIONAL DESCRIPTION
Program Memory (ROM)
Ø The GMS36/37XXX series can incorporate maximum 1,024 words (64 words 16
Ø 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)
0
8
1
2
3
4
5
6
7
Page 0
Page 1 Page 2
6
63
Page 15
0
A0~A5
Program counter (PC)
6
1
2
15
A6~A9
Page address register (PA)
4
4 ^{Page buffer (PB)}
(SR)
Stack register
(PSR)
(Level "1")
(Level "2")
(Level "3")
Fig 4-1 Configuration of Program Memory
4-1