em78p510nso32j/s ELAN Microelectronics Corp, em78p510nso32j/s Datasheet - Page 16

• Manufacturer Part Number: em78p510nso32j/s
• Description: 8-bit Microprocessor With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P510N
8-Bit Microprocessor with OTP ROM
10 •
6.2.3 R2 (Program Counter)
The structure is depicted in Figure 6-2. Generates 8K × 13 on-chip ROM addresses to
the relative programming instruction codes.
"JMP" instruction allows the direct loading of the low 10 program counter bits.
"CALL" instruction loads the low 10 bits of the PC and PC+1, and then push into the
stack.
"RET'' ("RETL k", "RETI") instruction loads the program counter with the contents at the
top of stack.
"MOV R2, A" allows the loading of an address from the A register to the PC, and
contents of the ninth and tenth bits don't change.
"ADD R2, A" allows a relative address be added to the current PC, and contents of the
ninth and tenth bits don't change.
User can use Long jump (LJMP) or long call (LCALL) instructions to program user's
code. And the program page is maintained by ELAN's compiler. It will change user's
program by inserting instructions within the program.
Figure 6-2 Program Counter Organization
(This specification is subject to change without further notice)
Product Specification (V1.1) 01.25.2008