UPD17015 Datasheet, PDF (14/120 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR PORTABLE RADIOS

µPD17015
2. PROGRAM MEMORY (ROM)
2.1 OUTLINE OF PROGRAM MEMORY
Fig. 2-1 outlines program memory.
As shown in Fig. 2-1, program memory is addressed with a program counter. Program memory is used to store
programs. The program counter is used to specify an address in program memory.
Fig. 2-1 Outline of Program Memory
Program counter
Addressing
Program memory
Instruction
2.2 PROGRAM MEMORY CONFIGURATION
Fig. 2-2 shows the configuration of program memory.
As shown in Fig. 2-2, program memory consists of 1528 steps × 16 bits.
Program memory therefore has addresses 0000H to 05F7H.
All µPD17015 instructions are 16-bit one-word instructions. Each instruction can be stored at a single address
of program memory.
Fig. 2-2 Program Memory Configuration
0000H
05F7H
07FFH
1.5K steps
16 bits
Undefined
14