PD17225_15 Datasheet, PDF (13/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
2. MEMORY SPACE
2.1 Program Counter (PC)
The program counter (PC) specifies an address of the program memory (ROM).
The program counter is an 11/12/13-bit binary counter as shown in Figure 2-1.
Its contents are initialized to address 0000H at reset.
Figure 2-1. Configuration of Program Counter
Page
MSB
LSB
PC12 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
PC (µPD17225)
PC (µPD17226)
PC (µPD17227, 17228)
2.2 Program Memory (ROM)
The configuration of the program memory is as follows:
Part Number
µPD17225
µPD17226
µPD17227
µPD17228
Capacity
2048 × 16 bits
4096 × 16 bits
6144 × 16 bits
8192 × 16 bits
Address
0000H-07FFH
0000H-0FFFH
0000H-17FFH
0000H-1FFFH
The program memory stores a program, interrupt vector table, and fixed data table.
The program memory is addressed by the program counter.
Figure 2-2 shows the program memory map. The entire range of the program memory can be addressed by the BD
addr, BR @AR, CALL @AR, MOVT DBF, and @AR instructions. Note, however, that the subroutine entry addresses that
can be specified by the CALL addr instruction are from 0000H to 07FFH.
Data Sheet U12643EJ2V0DS00
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