UPD75236GJ Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD75236GJ

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75236

3.3 DATA MEMORY

The data memory consists of a static RAM and peripheral hardware.

The static RAM incorporates 512 words × 4 bits of memory banks 0 and 2, 160 words × 4 bits of memory

bank 1 and 96 words × 4 bits of memory bank 1 which also serves as a display data memory. It is used to store

process data and to serve as a stack memory for interrupt execution.

General registers, display data memory and various registers of peripheral hardware are mapped at particu-

lar addresses of the data memory and such data is manipulated by the general register and memory manipula-

tion instructions. (Refer to Fig. 2-1 Data Memory Configuration and Addressing Range in Each Addressing

Mode.)

All addresses (000H to 2FFH) of memory banks 0, 1 and 2 can be used as a stack area.

Although the data memory consists of one address and 4 bits, it can be manipulated in 8-bit units by the 8-

bit memory mainipulation instruction or in bit units by the bit manipulation instruction. Specify an even

address by the 8-bit manipulation instruction.

The display data memory area (1A0H to 1FFH) is made up as shown in Fig. 3-4.

Fig. 3-3 Data Memory Map

Data Area

Static RAM

(768 × 4)

General

Register

Area

Stack Area

Display

Data

Memory,

etc.

000H

01FH

020H

0FFH

100H

19FH

1A0H

1FFH

200H

Data Memory

(32 × 4)

256 × 4

256 × 4

(96 × 4)

Memory Bank

0

1

256 × 4

2

2FFH

Not Incorporated

F80H

Peripheral Hardware Area

128 × 4

15

FFFH

30

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