KSI-W002-000

6

6. Basic Function Block

6.1 Program Counter (PC)

Program counter is used to indicate the address of the next instruction to be executed.

The 10-bit program counter consists of two registers, PC

This is a polynomial counter.

6.2 Program Memory (ROM)

Program memory is used to store user-specified program. This consists of a 1024 x 8-bit.

It is organized in 16 pages and each page is 64 bytes long. For page-in addressing, all

instructions excluding JMPL and CALL can be executed by page. In order to execute jump

or call in page, JMP or CAL is suitable. For page-to-page addressing, JMPL or CALL must be

used.

Figure 6-1. Program Memory Map

SD6830

3

60

61

62

63

PAGE 15

0

1

2

PAGE 0

0

1

2

3

60

61

62

63

RESET

ADDRESS

000h

PROGRAM COUNTER

PCH (4-BIT)

PCL (6-BIT)

PROGRAM MEMORY