UPD17217CT datasheet(10/84 Pages) NEC

10 / 84 page

µPD17215, 17216, 17217, 17218

MEMORY SPACE

2.1

Program Counter (PC)

The program counter (PC) specifies an address of the program memory (ROM).

The program counter is a 11/12/13-bit binary counter as shown in Fig. 2-1.

Its contents are initialized to address 0000H at reset.

Fig. 2-1 Configuration of Program Counter

MSB

Page

PC12

PC10

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

LSB

PC11

PC ( PD17215)

PC ( PD17216)

PC ( PD17217, 17218)

2.2

Program Memory (ROM)

The configuration of the program memory is as follows:

Part Number

Capacity

Address

µPD17215

2048 x 16 bits

0000H-07FFH

µPD17216

4096 x 16 bits

0000H-0FFFH

µPD17217

6144 x 16 bits

0000H-17FFH

µPD17218

8192 x 16 bits

0000H-1FFFH

The program memory stores a program, interrupt vector table, and fixed data table.

The program memory is addressed by the program counter.

Fig. 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.

UPD17217CT Datasheet(PDF) 10 Page - NEC

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