UPD17P136ACT datasheet(42/292 Pages) NEC

42 / 292 page

CHAPTER 4

PROGRAM MEMORY (ROM)

The program organization of the

µPD17134A subseries is shown in Table 4-1.

Table 4-1. Program Memory Configuration

Product name

Program memory capacity

Program memory address

µPD17134A

2K bytes (1024

× 16 bits)

0000H-03FFH

µPD17135A

µPD17136A

µPD17137A

4K bytes (2048

× 16 bits)

0000H-07FFH

µPD17P136A

µPD17P137A

Program memory stores the program and the constant data table. The first area of the program memory is assigned

to reset start and interrupt vector addresses.

The program memory address is specified by the program counter.

4.1 PROGRAM MEMORY CONFIGURATION

Figure 4-1 shows the program memory map. Branch instructions, subroutine calls, and table references can specify

any address in program memory.

Figure 4-1. Program Memory Map for the

µPD17134A Subseries

0000H

0001H

0002H

0003H

03FFH

Address

Reset start address

Serial interface interrupt vector

Basic interval timer interrupt vector

Timer 1 interrupt vector

Subroutine entry

address for the CALL

addr instruction

Branch address for

the BR addr instruction

Branch address for

the BR @AR instruction

Subroutine entry

address for the CALL

@AR instruction

Table reference address

for the MOVT DBF, @AR

instruction

0004H

0005H

External (INT) interrupt vector

Timer 0 interrupt vector

16 bits

( PD17134A/17135A)

( PD17136A/17137A/17P136A/17P137A)

07FFH

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