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CSA3.84MG

4-BIT SINGLE CHIP MICROCOMPUTERS

Hynix Semiconductor 

Chapter 2. Architecture

Data memory (RAM)

Up to 32 nibbles (16 words ¡¿ 2pages ¡¿ 4bits) is incorporated for storing data.

The whole data memory area is indirectly specified by a data pointer (X,Y). Page

number is specified by zero bit of X register, and words in the page by 4 bits in

Y-register. Data memory is composed in 16 nibbles/page. Figure 2.2 shows the

configuration.

D0 D9 R0 R3 REMOUT

Output port

Data memory page (0~1)

01

23

Page 0

Page 1

15

4 A0~A3

Y-register (Y)

01

X-register (X)

4

2

Fig 2-2 Composition of Data Memory

X-register (X)

X-register is consist of 2bit, X0 is a data pointer of page in the RAM, X1 is only

used for selecting of D8~D9 with value of Y-register

X1=0

X1=1

Y=0

D0

D8

Y=1

D1

D9

Table 2-1 Mapping table between X and Y register

2- 3

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