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EM78P516N Scheda tecnica(PDF) 21 Page - ELAN Microelectronics Corp

Il numero della parte EM78P516N
Spiegazioni elettronici  8-Bit Microcontroller
PDF  98 Pages
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Produttore elettronici  EMC [ELAN Microelectronics Corp]
Homepage  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P516N Scheda tecnica(HTML) 21 Page - ELAN Microelectronics Corp

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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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