UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 29
Manufacturer Part Number
4 BIT SINGLE-CHIP MICROCOMPUTER
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).
Fig. 3-3 Data Memory Map
4 bits in memory bank 1, which is used also as display