UPD17231 datasheet(14/94 Pages) RENESAS

14 / 94 page

Data Sheet U14360EJ1V0DS00

µPD17230, 17231, 17232, 17233, 17234, 17235, 17236

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 and a 1-bit segment counter (SGR) as shown in Figure

2-1.

Its contents are initialized to address 0000H at reset.

Figure 2-1. Configuration of Program Counter

2.1.1

Segment register (SGR)

The segment register specifies a segment of the program memory.

Table 2-1 shows the relation between the segment register and program memory.

Table 2-1. Relation between Segment Register and Program Memory

Value of Segment Register

Segment of Program Memory

Segment 0

Segment 1

The segment register is set when the following instructions are executed:

•

BR @AR

•

CALL @AR

•

SYSCAL entry

Page

PC ( PD17230)

MSB

LSB

SGR

PC12

PC11

PC10

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

PC ( PD17231)

PC ( PD17232, 17233)

PC ( PD17234, 17235, 17236)

UPD17231 Datasheet(PDF) 14 Page - Renesas Technology Corp

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