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EM78P516NH 데이터시트(PDF) 21 Page - ELAN Microelectronics Corp |
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EM78P516NH 데이터시트(HTML) 21 Page - ELAN Microelectronics Corp |
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21 / 98 page ![]() EM78P516N 8-Bit Microcontroller Product Specification (V1.0) 04.09.2015 •••• 15 (This specification is subject to change without prior notice) 6.1.4 R3, SR (Status Register) (Address: 03h) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PS2 PS1 PS0 T P Z DC C R/W R/W R/W R/W R/W R/W R/W R/W Bits 7 ~ 5 (PS2 ~ 0): Page Select bits PS2 PS1 PS0 Program memory page (Address) 0 0 0 Page 0 0 0 1 Page 1 0 1 0 Page 2 0 1 1 Page 3 1 0 0 Page 4 1 0 1 Page 5 1 1 0 Page 5 1 1 1 Page 5 PS0~PS2 are used to select a ROM page. User can use the PAGE instruction (e.g. PAGE 1) or set PS2~PS0 bits to change the ROM page. When executing a "JMP", "CALL", or other instructions which causes the program counter to be changed (e.g. MOV R2, A), PS2~PS0 are loaded into the 11th and 12th bits of the program counter where it selects one of the available program memory pages. Note that RET (RETL, RETI) instruction does not change the PS2~PS0 bits. That is, the return will always be to the page from where the subroutine was called, regardless of the current setting of PS2~PS0 bits. Bit 4 (T): Time-out bit. Set to “1” by the "SLEP" and "WDTC" commands or during power up and reset to “0” by WDT timeout. Event T P Remark WDT wake up from sleep mode 0 0 − WDT time out (not sleep mode) 0 1 − /RESET wake up from sleep 1 0 − Power up 1 1 − Low pulse on /RESET 1 1 ××××: don't care Bit 3 (P): Power down bit. Set to “1” during power on or by a "WDTC" command and reset to “0” by a "SLEP" command. Bit 2 (Z): Zero flag Bit 1 (DC): Auxiliary Carry flag Bit 0 (C): Carry flag |
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