HT49CV7 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
HT49CV7 Datasheet PDF : 48 Pages
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HT49RV7/HT49CV7
M in im u m o n e in s tr u c tio n c y c le n e e d e d
STAR T
EO CB
A /D s a m p lin g tim e
3 2 tA D
A /D s a m p lin g tim e
3 2 tA D
P C R 2~P C R 0
000B
100B
100B
000B
1 . P B p o rt s e tu p a s I/O s
2 . A /D c o n v e r te r is p o w e r e d o ff
to r e d u c e p o w e r c o n s u m p tio n
A C S 2~A C S 0
000B
010B
000B
P o w e r-o n
R eset
S ta rt o f A /D
c o n v e r s io n
S ta rt o f A /D
c o n v e r s io n
R e s e t A /D
c o n v e rte r
1 : D e fin e P B c o n fig u r a tio n
2 : S e le c t a n a lo g c h a n n e l
R e s e t A /D
c o n v e rte r
E n d o f A /D
c o n v e r s io n
E n d o f A /D
c o n v e r s io n
7 6 tA D
A /D c o n v e r s io n tim e
7 6 tA D
A /D c o n v e r s io n tim e
d o n 't c a r e
N o te : A /D c lo c k m u s t b e fS Y S /2 , fS Y S /8 o r fS Y S /3 2
A/D Conversion Timing
VFD Display Memory
The HT49RV7/HT49CV7 provides an area of embed-
ded data memory for the VFD display. This area is lo-
cated from 40H to 55H of the RAM at Bank 1. The Bank
Pointer (BP; located at 04H of the RAM) is the switch for
the RAM and the VFD display memory. When the BP is
set as ²1², any data written into 40H~55H will affect the
VFD display. When the BP is written as ²0², ²2², ²3² or
²4² any data written into 40H~55H is meant to access
the general purpose data memory. The VFD display
memory can be read and written to only by an indirect
addressing mode using MP1. When data is written into
the display data area, it is automatically read by the VFD
driver which then generates the corresponding VFD
driving signals. To turn the display on or off, a ²1² or a
²0² is written to the corresponding bit of the display
memory, respectively. The figure illustrates the mapping
between the display memory and VFD pattern for the
HT49RV7/HT49CV7.
Grid0
Grid1
Grid2
Grid3
Grid4
Grid5
Grid6
Grid7
Grid8
Grid9
Grid10
SEG15~SEG12
41HU
43HU
45HU
47HU
49HU
4BHU
4DHU
4FHU
51HU
53HU
55HU
SEG11~SEG8
41HL
43HL
45HL
47HL
49HL
4BHL
4DHL
4FHL
51HL
53HL
55HL
SEG7~SEG4
40HU
42HU
44HU
46HU
48HU
4AHU
4CHU
4EHU
50HU
52HU
54HU
SEG3~SEG0
40HL
42HL
44HL
46HL
48HL
4AHL
4CHL
4EHL
50HL
52HL
54HL
VFD Display Memory
Rev. 1.00
28
April 20, 2006
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