EF9345 datasheet(36/38 Pages) STMICROELECTRONICS

36 / 38 page

General Purpose Access to a Byte OCT

This command uses either MP or AP pointer.

When MP is in use, an overflow yields to a Y

incrementation.

Move Buffer Commands : MVB, MVD, MVT

These are memory to memory commands which

use R1 as working register.

MVB transfers a byte from source to destination,

post-increments the 2 pointers and iterates until the

stop condition is met. MVD and MVT are similar but

work respectively with 2 byte word and 3 byte word.

That is to say, MVB works on buffers, MVD on

double buffers and MVT on triple buffers. If the

parameter a = 1, the process stops when either

source or destination buffer end is reached. If the

parameter a = 0, the process never stops until

aborted. In this case, main pointer overflow yields

to a Y incrementation in MP. So, a whole block or

page may be initialized.

Miscellaneous Commands : INY, VRM and

VSM

INY command increments Y in MP.

VRM and VSM respectively reset and set a vertical

synchronization status mask. When the mask is

set, status bit S2 remains at 0. When the mask is

reset, status S2 follows the vertical sync. state : it

is reset for 2 TV lines per frame and stays at 1

during the remaining period. It becomes readable

by the microprocessor form the status register.

After power on, the mask state is undetermined.

Table 4 : Command

Type

Memo

Code

Parameter

Status

Arguments

Execution Time (1)

654

AI LXm LXa R17 R1 R2 R3 R4 R5 R6 R7

Write

Read

Indirect

IND

R/W

---MP

3.5

40 Characters - 24 bits

KRF

R/W

7.5

40 Characters - 16 bits

KRG

R/W

A* B* W

5.5

7.5

80 Characters - 8 bits

KRC

R/W

---MP

9.5

80 Characters - 12 bits

KRL

R/W

12.5

11.5

40 Characters Variable

KRV

R/W

(2) 3 + 3 + j

3.5 +

6* j

Expansion

EXP

PW XF

(3) < 247

Compression

CMP

PW XF

(3) < 402

Expanded Characters

KRE

R/W

7.5

Byte

OCT

R/W

4.5

Move Buffer

MVB

(2) 2 + 4. n

Move Double Buffer

MVD

(2) 2 + 8. n

Move Triple Buffer

MVT

(2) 2 + 12. n

Clear Page (4) - 24 Bits

CLF

< 4700

(1 K code)

Clear Page (4) - 16 bits

CLG

A* B* W

< 5800

(1 K code)

Vertical Sync Mask Set

VSM

Vertical Sync Mask Reset

VRM

Increment Y

INY

No Operation

NOP

Pointer select

1 : auxiliary pointer

0 : main pointer

s, s

Source, destination

01 : source = MP ;

destination = AP

10 : source = AP ;

destination = MP

a, a

Stop condition

01 : stop at end of buffer

10 : no stop

Indirect register number

Not affected

Used as working register

(Z, YW)

Working buffer

Set or Reset

X File

Pointer incrementation

Data

Main pointer

Auxiliary pointer

(1) Unit :

12 clock periods (

≈ 1µs)

without possible suspension.

(2) n

total number of word

≤ 40 ;

j = 1 for long code,

j = 0 for short codes.

(3)

Worst case (20 long codes +

20 short codes).

(4)

These commands repeats KRF

or KRG with Y incrementation

when X overflows. When the

last position is reached in a

row. Y is incremented and the

process starts again on the

next row.

EF9345

36/38

EF9345 Datasheet(PDF) 36 Page - STMicroelectronics

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