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TC9028AF

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

Toshiba 

TC9028AP/AF

2.5 Program memory (ROM)

Program memory stores program and fixed data. The next instruction to be executed is read from the

address indicated by the program counter.

Physical program memory doesn’t exist in addresses 300~3FFH.

When this area is read on the program, 7FH ([NOP] instruction) is read.

Address

000 H

768 × 8 bit

Reset start address

002

Entry address for subroutine call by

[CALLS a] instruction

01E

2F0

[LDL A, @DC]

[LDH A, @DC]

2FF

Data conversion table for instructions.

300

7FH ([NOP] instruction)

3FF

Figure 2.2 Program memory map

2.6 L register (LR)

The L register is a 4bit register. It is used as a data memory (RAM) address pointer. It can also be used

as a general-purpose register.

5

2002-04-19

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