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EPVP6200 Datasheet(PDF) 16 Page - ELAN Microelectronics Corp

Part No. EPVP6200
Description  VFD Controller
Download  57 Pages
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Maker  EMC [ELAN Microelectronics Corp]
Homepage  http://www.emc.com.tw
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ePVP6200
VFD Controller
10 of 57
11.18.2004 (V1.53)
This specification is subject to change without further notice.
"TBL" allows a relative address to be added to the current PC, and the contents of the ninth
and tenth bits do not change. The most significant bit (A10~A13) will be loaded with the
contents of bit PS0~PS3 in the status register (R5 PAGE 1) upon execution of a "JMP,”
"CALL,” "ADD R2, A.” or "MOV R2, A'' instruction.
If an interrupt is triggered, PROGRAM ROM will jump to address 0x08 at Page0. The CPU
will automatically store ACC, R3 status, and R5 PAGE 1, and they will be restored after
execution of instruction RETI.
7.2.4 R3 (Status, Page Selection)
(Status Flag, Page Selection Bits)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RPAGE1
RPAGE0
IOCPAGE
T
P
Z
DC
C
R/W-0
R/W-0
R/W-0
R
R
R/W
R/W
R/W
Bit 0 (C) :
Carry flag
The carry flag is affected by following operation :
a. Addition : CF as a carry out indicator, when the addition operation has a carry-out,
CF will be "1", in
another word, if the operation has no carry-out, CF will be "0".
b. Subtraction : CF as a borrow-in indicator, when the subtraction operation must has
a borrow-in, the CF
will be "0", in another word, if no borrow-in, CF will be "1".
c. Comparision : CF is as a borrow-in indicator for Comparision operation as the
same as subtraction
operation.
d. Rotation : CF shifts into the empty bit of accumulator for the rotation and holds the
shift out data after
rotation.
Bit 1 (DC) : Auxiliary carry flag
Bit 2 (Z) :
Zero flag
ZF is affected by the result of ALU, if the ALU operation generate a "0" result, the ZF
will be "1", otherwise, the ZF will be "0".
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.




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