UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 29

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UPD75238GJ

Manufacturer Part Number
UPD75238GJ
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet
3.3 DATA MEMORY (RAM)
data memory. The RAM is used for storing processing data, and is also used as stack memory for subroutine
and interrupt execution.
registers) are mapped. Data in these areas are manipulated using general register manipulation instructions
and memory manipulation instructions (See Fig. 2-1).
instructions to be used for 8-bit oriented manipulation, and also allows bit manipulation instructions to be
used for bit-by-bit manipulation. Even addresses are to be specified for 8-bit manipulation instructions.
4 bits in memory bank 1, and an area of 96 words
The data memory consists of a static RAM and peripheral hardware.
The static RAM consists of an area of 768 words 4 bits in memory banks 0, 2, and 3, an area of 160 words
To particular memory addresses, general registers, display data memory, and peripheral hardware (various
As a stack area, all addresses in memory banks 0, 1, 2, and 3 (000H to 3FFH) can be used.
The data memory has a configuration of 4 bits per address, but allows 8-bit memory manipulation
Fig. 3-4 shows the organization of the display data memory area (1A0H to 1FFH).
Data area
Static RAM
(1024
4)
Stack
area
Display
data
memory,
etc.
General
register
area
Peripheral
hardware area
Fig. 3-3 Data Memory Map
3 FFH
1A0H
19FH
4 bits in memory bank 1, which is used also as display
000H
01FH
020H
0FFH
100H
1FFH
200H
2FFH
300H
F80H
FFFH
Not contained
Data memory
(32
256
256
(96
256
256
128
4)
4)
4
4
4
4
4
Memory bank
PD75238
15
0
1
2
3
29

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