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EM78P447NAM Datasheet(PDF) 9 Page - ELAN Microelectronics Corp |
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EM78P447NAM Datasheet(HTML) 9 Page - ELAN Microelectronics Corp |
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9 / 57 page  EM78P447N OTP ROM • The contents of the prescaler counter will be cleared only when TCC register is written a value. 3. R2 (Program Counter) & Stack • Depending on the device type, R2 and hardware stack are 10-bit wide. The structure is depicted in Fig.3. • Generating 1024 ×13 bits on-chip OTP ROM addresses to the relative programming instruction codes. One program page is 1024 words long. • R2 is set as all "0"s when under RESET condition. • "JMP" instruction allows direct loading of the lower 10 program counter bits. Thus, "JMP" allows PC to go to any location within a page. • "CALL" instruction loads the lower 10 bits of the PC, and then PC+1 is pushed into the stack. Thus, the subroutine entry address can be located anywhere within a page. • "RET" ("RETL k", "RETI") instruction loads the program counter with the contents of the top-level stack. • "ADD R2,A" allows the contents of ‘A’ to be added to the current PC, and the ninth and tenth bits of the PC are cleared. • "MOV R2,A" allows to load an address from the "A" register to the lower 8 bits of the PC, and the ninth and tenth bits of the PC are cleared. • Any instruction that writes to R2 (e.g. "ADD R2,A", "MOV R2,A", "BC R2,6", ⋅⋅⋅⋅⋅) will cause the ninth and tenth bits (A8~A9) of the PC to be cleared. Thus, the computed jump is limited to the first 256 locations of a page. • All instruction are single instruction cycle (fclk/2 or fclk/4) except for the instruction that would change the contents of R2. Such instruction will need one more instruction cycle. A7 ~ A0 On-chip Program Memory 000H FFFH 001H Hardware Vector Software Vector Reset Vector 002H A9 A8 A11 A10 Stack Level 1 Stack Level 3 Stack Level 2 Stack Level 4 Stack Level 5 CALL 00 PAGE0 0000~03FF 01 PAGE1 0400~07FF 10 PAGE2 0800~0BFF 11 PAGE3 0C00~0FFF R3 RET RETL RETI Fig. 3 Program Counter Organization This specification is subject to change without prior notice. 10.21.2004 (V1.0) 9 |
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