HT49CV7 datasheet(28/48 Pages) HOLTEK

28 / 48 page

HT49RV7/HT49CV7

Rev. 1.00

April 20, 2006

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.

7 6 t A D

A / D c o n v e r s i o n t i m e

7 6 t A D

A / D c o n v e r s i o n t i m e

0 0 0 B

1 0 0 B

0 1 0 B

0 0 0 B

S T A R T

E O C B

P C R 2 ~ P C R 0

A C S 2 ~ A C S 0

P o w e r - o n

R e s e t

E n d o f A / D

c o n v e r s i o n

1 : D e f i n e P B c o n f i g u r a t i o n

2 : S e l e c t a n a l o g c h a n n e l

1 . P B p o r t s e t u p a s I / O s

2 . A / D c o n v e r t e r i s p o w e r e d o f f

t o r e d u c e p o w e r c o n s u m p t i o n

A / D c l o c k m u s t b e f S Y S / 2 , f S Y S / 8 o r f S Y S / 3 2

N o t e :

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

1 0 0 B

0 0 0 B

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

A / D s a m p l i n g t i m e

3 2 t A D

M i n i m u m o n e i n s t r u c t i o n c y c l e n e e d e d

d o n ' t c a r e

A / D s a m p l i n g t i m e

3 2 t A D

E n d o f A / D

c o n v e r s i o n

A/D Conversion Timing

SEG15~SEG12

SEG11~SEG8

SEG7~SEG4

SEG3~SEG0

Grid0

41HU

41HL

40HU

40HL

Grid1

43HU

43HL

42HU

42HL

Grid2

45HU

45HL

44HU

44HL

Grid3

47HU

47HL

46HU

46HL

Grid4

49HU

49HL

48HU

48HL

Grid5

4BHU

4BHL

4AHU

4AHL

Grid6

4DHU

4DHL

4CHU

4CHL

Grid7

4FHU

4FHL

4EHU

4EHL

Grid8

51HU

51HL

50HU

50HL

Grid9

53HU

53HL

52HU

52HL

Grid10

55HU

55HL

54HU

54HL

VFD Display Memory

HT49CV7 Datasheet(PDF) 28 Page - Holtek Semiconductor Inc

HT49CV7 Datasheet(HTML) 28 Page - Holtek Semiconductor Inc

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