MXIC MX93521UC Datasheet

1. FEATURES

MX93521

APPLICATION NOTE V7

• Excellent sound quality by adopting 4.8Kbps CELP and
13Kbps speech compression alogorithm.

• Silent Compression algorithm to further compress si
lence between speech.

• Flash Memory Management alogorithm to manage
down-graded Flash Memory to store compressed
speech data. With silent compression, one 4Mbit flash
memory could store up to 18 minutes speech.

• Support 4/16/32/64M bit Samsung flash memory or
its compatible parts.

• Support both parallel and serial microprocessor inter­face.

• Codec Interface circuit (support both TP3054, MX93000
and MX93000C).

• Host controllable LCD Module Interface.

• Host writable message header (4 bytes) for identifica­tion or index purpose.

• Powerful Editing Function.

• Varieties of operating function including Rewind, Fast
Forward, Repeat and message editing etc.

• Voice activated recording.

• Use Flash memory to store user data (data bank)

• Upload/Download speech message data from/to
HOST.

• VOCODER mode (VOice COmpressor/
DEcompressoR).

• Direct CODEC Play Mode (Play PCM/u-Law data re
ceived from HOST).

• Play Voice Prompt from ROM/FLASH memory

• DTMF tone genarator.

2.GENERAL DESCRIPTION

This document describes how to implement an all-digital voice recorder using the MX93521 chip. The MX93521 is a
Digital Recorder Data Pump which is controlled by an external microprocessor to perform various recorder function.

The MX93521 is fully controlled by a HOST controller through a simple HOST interface protocol. The HOST could
initiate many digital recording functions such as record, play, repeat, search, skip, insertion, message managing and
self-diagnosis. Also, HOST could set MX93521 in VOCODER mode and use MX93521 as a speech compression/
decompression data pump. The functions supported by MX93521 are listed as followed.

MODE FUNCTION P A TH
RECORD CODEC-->(COMPRESS)-->FLASH
PLAY CODEC-->(DECOMPRESS)<--FLASH
RECORD (VOCODER) CODEC-->(COMPRESS)-->HOST
PLA Y (VOCODER) CODEC-->(DECOMPRESS)<--HOST
DIRECT CODEC PLA Y MODE CODEC-->(PCM/u-Law)<--HOST
DOWNLOAD MESSAGE FLASH(MSG)-->HOST
UPLOAD MESSAGE FLASH(MSG)<--HOST
DAT ABANK ACCESS FLASH(DAT A)<-- -->HOST

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1

3.PIN CONFIGURATIONS

3.1 Pinout Assignments for MX93521 100-Pin LQFP (Parallel Mode)

100-LQFP PIN ASSIGNMENT

ED8

ED7

ED6

ED5

ED4

ED3

ED2

ED1

GND

VDSP

ED0

HOLD\

HOLDA\

EDCE\

EPCE\

ERD\

EWR\

EAD0

EAD1

75747372717069686766656463626160595857565554535251

ED9
ED10
ED11
ED12
ED13

VDSP

GND
ED14
ED15

XTLI

XTLO

NC
NC
NC
NC

MIC-E\

SPK-E\

RST\

EROM
SDEN\
SDATA

WP\

RxCmd

USO3
USO2

76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

MX93521-V7

EAD2

EAD3

EAD4

EAD5

EAD6

FLL\

MX93521

50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26

EAD7
NC
EAD8
EAD9
EAD10
EAD11
EAD12
EAD13
EAD14
GND
VDSP
EAD15
VDSP
SCLK
VDSP
DSPDR
DA\
CMCLK
CFS
DSPDX
SOUT
PHDB0
PHDB1
PHDB2
PHDB3

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NC

NC

LED2\

LED1\

CE1\

USO1

CE2\

ALE

USO0

CLE

X32I

X32O

P ACKB\

S/P

SIN

CODEC TYPE

R/B

NC

SHOLD\

GND

VDSP

PHDB7

PHDB6

PHDB5

2

PHDB4

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3.2 Pinout Assignments for MX93521 100-Pin LQFP (Serial Mode)

100-LQFP PIN ASSIGNMENT

ED8

ED7

ED6

ED5

ED4

ED3

ED2

ED1

GND

VDSP

ED0

HOLD\

HOLDA\

EDCE\

EPCE\

ERD\

EWR\

EAD0

75747372717069686766656463626160595857565554535251

ED9
ED10
ED11
ED12
ED13

VDSP

GND
ED14
ED15

XTLI

XTLO

NC
NC
NC

NC
MIC-E\
SPK-E\

RST\

EROM
SDEN\
SDATA

WP\

RxCmd

USO3
USO2

76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

MX93521-V7

EAD1

EAD2

EAD3

EAD4

EAD5

EAD6

FLL\

MX93521

50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26

EAD7
NC
EAD8
EAD9
EAD10
EAD11
EAD12
EAD13
EAD14
GND
VDSP
EAD15
VDSP
SCLK
VDSP
DSPDR
DA\
CMCLK
CFS
DSPDX
SOUT
BIO0
BIO1
BIO2
BIO3

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NC

NC

LED2\

LED1\

CE1\

USO1

CE2\

ALE

USO0

CLE

X32I

X32O

P ACKB\

S/P

SIN

CODEC TYPE

R/B

NC

SHOLD\

GND

VDSP

BIO7

BIO6

BIO5

3

BIO4

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MX93521

4.PIN DESCRIPTION

4.1 DSP BASIC (22 PINS )
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

VDSP 20,40,66,81,38,36 5V power source
GN D 21,41,67,82 Ground
FLL\ I 51 FLL\ low to set MX93521 running from single

low crystal
XTLI 8 5 32.256Mhz Crystal input
XTLO 86 32.256Mhz Crystal output
RST\ I 9 3 Power on Reset, Schmite triggered
PACKB\ OA 1 1 In serial mode, PACKB\ is N.C.

In parallel mode, PACKB\ becomes low when

MX93521 write data to BIO and high when

HOST read from BIO.
HOLD\ I 64 Hold DSP clock down and release bus
HOLDA\ OA 63 Ack to HOLD\ signal
EROM I 94 Disable internal ROM, use external ROM only
SCLK I 37 T ransmit/receive data clock
X32O OA 10 32.768Khz Crystal output
X32I 9 32.768Khz Crystal input

4.2 DSP EXTERNAL MEMORY(40 pins)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

EAD0-EAD15 OB 58~52,50,48~42,39 Address Bus
ED0~ED15 I/OB 65,68~80,83~84 Data Bus
EDCE\ OB 6 2 External data chip enable
EPCE\ OB 6 1 Resered for future use
ERD\ OB 60 Flash external read
EWR\ OB 59 Flash external write
N C 87~90 No connection

4.3 uP INTERF ACE(10 pins)

4.3.1 Serial Interface:(UPMODX=1)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

DA \ O C 34 Data Availab le (Output port OPT17)
SOUT O C 30 Serial Data Out (Output port OPT16)
BIO(7..0) OB 22~29 Drive LCD Display

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MX93521

4.3.2 Parallel Interface:(UPMODX=0)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

PHRDB\ I 34 Host read
PHWRB\ I 3 0 Host write
PHDB(7:0) B 22~29 Host data bus

4.4 CODEC (4 pins)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

CFS OB 32 Codec frame sync, 8Khz
CMCLK OB 33 Codec master clock, 1.536Mhz
DSPDX OA 3 1 Codec data transmit
DSPDR I 35 Codec data receive

4.5 OPT:OUT PORT(16 pins)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

CL E OC 8 Flash memory command latch enable
ALE OC 7 Flash memory address latch enable
N.C. 3,6
CE2\ OC 5 Chip enable 2
CE1\ OC 4 Chip enable 1
LED1\ OC 2 LED1 enable
LED2\ OC 1 LED2 enable

DR-V5

N.C.
RxCmd

WP\ OC 9 7 Flash memory write protection
SD AT A O C 96 Serial data transfer (for MX93000, MX93000C)
SDEN\ OC 95 Serial data enable (for MX93000, MX93000C)
SPK-E OC 92 Speaker enable,Hi-active
MIC-E\ O C 9 1 Microphone enable
USO3 OC 99 User output port
USO2 OC 100 User output port
USO1 OC 3 User output port
USO0 OC 6 User output port

DR-V5

OC 98 Received Command (toggle when re

ceived command from HOST)

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MX93521

4.6 IPT:INPUT PORT(8 pins)
SYMBOL TYPE PIN # (LQFP) DESCRIPTION

NC I 19
NC I 18
SHOLD\ I 17 Power down detect
NC I 16
R/B I 1 5 Flash memory Ready/Busy
CODECTYPE I 1 4 Codec select (TP3054B or MX93000, MX93000C)
SIN I 1 3 Serial data input
S/P\ I 12 Serial/paralled interface

NOTE:O A:2mA,OB:4mA,OC:16mA output current

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5. HOST CONTROLLER INTERFACE

5.1 HOST CONTROLLER INTERF ACE

5.1.1 Configuration

MX93521

HOST

HOST

OUT1

OUT2

IN1

IN2

OUT3

IN3

OUT1

OUT2

IN1

OUT3

D0-7

IN2

40

16

37

33

96

1

SERIAL MODE

40

33

37

14

16

96

32-25

1

SCLK

SIN

DA\

SOUT
RST\
RxCmd

SCLK
PHWRB\
PHRDB\
PACKB\
SIN
RST\
PHDB0-7
RxCmd

MX93521

PHILO\

MX93521

S/P\

S/P\

15

VCC

39

VCC

15

Gnd

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MX93521

5.1.2 Timing Diagrams

HOST Write Timing (Parallel Mode)

PHDB0-7

ts

PHWRB\

SCLK

(INT1\)

RxCmd

HOST Write Timing (Parallel Mode)

tp

HOST should cycle PHWRB\ after writing data to PHDB0-7.
MX93521 will read data from PHDB0-7 on the falling edge of SCLK (rising edge of PHWRB\).
Rxcmd will be toggled if command byte has been processed by MX93521

th

tp

The PHWRB\ signal will cause MX93521 to latch data from bus PHDB0-7 to MX93521 internal register. The invertted
signal of PHWRB\ will trigger MX93521 INT1\ to read and process the received data byte from internal register. Due
to the interrupt contention, there might be an up to 50 us delay between the rising edge of PHWRB\ and INT1\ actually
being served. To keep from command overrun, HOST should check if RxCmd toggled or w ait 50 usec before sending
next command byte to MX93521.

HOST Read Timing (P arallel Mode)

PHDB0-7

ts

PACKB\

ta

PHRDB\

HOST Read Timing (Parallel Mode)

When MX93521 write data to PHDB0-7, P ACKB\ will become lo w. HOST needs to poll the status of PACKB\ continu­ously . When HOST detect low state on PACKB\, HOST should read out data from PHDB0-7. After HOST read the data
from PHDB0-7, PACKB\ will be reset to high.
The maxima delay between MX93521 write data to PHDB0-7 and PACKB\ become low is 10 ns.
The maxima delay between rising edge of PHRDB\ and PACKB\ become high is also 10 ns.

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HOST Write Timing (Serial Mode)

HOST output data SIN

HOST output clock SCLK

MX93521

ts

tp

tp

tp

RxCmd

DSP Sampling from SIN

HOST send data 61H tp DSP

start d01d10d20d30d4

0

61H

d5

d61d70stop

1

HOST Write Timing (Serial Mode)

RxCmd become low when start bit is received from HOST and toggle state when MX93521 received each follo wing
data bit or stop bit from HOST . Thus, instead of waiting f or a fixed period of time (50us) to send a command bit, HOST
could send the following command bit as soon as RxCmd toggled from pre vious state. The dela y between the falling
edge of SCLK and the RxCmd togglling time is range from 1 us to 50 us

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HOST Read Timing (Serial Mode)

DSP inform HOST

Data Available

DA\

>50us, clock rate

HOST output clock

SCLK

5-40us, SOUT response time

DSP output data

SOUT

HOST Sampling from

SOUT

DSP send data 49H

startx

to HOST

d0

d1

d2

1

0

d3

0

1

49H

HOST Read Timing (Serial Mode)

d4

MX93521

d5

0

0

d61d70stop

SOUT response time is 5-40us from the falling edge of SCLK
It is recommended that HOST sample SOUT right before the falling edge of SCLK

uP Interface Timing:

Min Max
Data setup time (ts) 10ns
Data hold time (th) 2ns
Data process time (tp) 1us 50us
P A CKB\ acknowledge time (ta) 5ns

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MX93521

5.2 MX93521 IO INTERF AC E

5.2.1 Output Port
PIN (PQFP) PIN (LQFP) P ower down state

LED1\ O 5 2 LED1 CONTROL High
LED2\ O 4 1 LED2 CONTROL High
USO3* O 2 99 User Programmable Output P ort High
USO2* O 3 100 User Programmable Output P ort High
USO1* O 6 3 User Programmable Output Port High
USO0* O 9 6 User Programmable Output Port High

* USO3, 2, 1, 0 are user output port and only available in DR-V7

5.2.2 Flash Memory Interface

MX93521 PIN Flash Power down state

NC I 22 X
NC I 21 X
NC I 19 X
CLE O 11 CLE Low
ALE O 10 ALE L ow
ERD\ O 63 R D\
CE2\ O 8 CE2\ High
CE1\ O 7 CE1\ High
EWR\ O 62 WR\
R\B I 1 8 R/B\
WP\ O 10 0 WP\ Low
ED0 IO 68 IO0
ED1 IO 71 IO1
ED2 IO 72 IO2
ED3 IO 73 IO3
ED4 IO 74 IO4
ED5 IO 75 IO5
ED6 IO 76 IO6
ED7 IO 77 IO7

5.2.3 CODEC Interface

MX93521 PIN Power down state

CODECTYPE I 17 (1: MX93000,MX93000C 0:TP3054)
DSPDR O 38
DSPDX O 34
CFS O 35
CMCLK O 36
SDA T A O 99 High
SDEN\ O 9 8 High
SPK_E O 95 Lo w
MIC_E\ O 94 High

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MX93521

5.2.4 uP Serial Mode Interface

MX93521 uP LC D

RxCmd O IN3 (optional) MX93521 Rxd Command Indicator
S/P\ I Vcc High, Serial Mode, Low=P arallel Mode
SCLK I OUT1 Serial Clock
DA \ O IN1 Data Available
SOUT O IN2 Serial Data Output
SHOLD\ I OUT3 DSP HOLD
SIN I OUT2 Serial Data Input
RST\ I OUT4 DSP RESET
BIO2 O E
BIO3 O RS
BIO4 O D4
BIO5 O D5
BIO6 O D6
BIO7 O D7

5.2.5 uP Parallel Mode Interface

MX93521 uP LCD

S/P\ I GN D Lo w , P ar allel Mode, High=Serial Mode
SCLK I OUT1\
PHRDB\ I OUT2 Read
PHWRB\ I OUT1 Write
SHOLD\ I OUT3 DSP HOLD
RST\ I OUT4 DSP RESET
PHILO\ I Vcc High, Byte Mode
SIN I IN 1 SIN should be connected to PACKB\ externally
PACKB\ O IN 1 Acknowledge
RxCmd O IN2 (optional) MX93521 Rxd Command Indicator
PHDB0 I/O D0
PHDB1 I/O D1
PHDB2 I/O D2
PHDB3 I/O D3
PHDB4 I/O D4
PHDB5 I/O D5
PHDB6 I/O D6
PHDB7 I/O D7

When SHOLD\ is low , MX93521 will go to power down mode .
When SHOLD\ change from low to high, DSP will power up and send ACK0 to HOST

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MX93521

6. HOST INTERFACE SOFTWARE COMMAND SET SUMMARY

6.1 HOST TO MX93521 COMMANDS

When MX9521 received a command from HOST, it will always respond the command with a ackno wledge. The
valid commands and corresponded ackno wledge are described as below .

D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 1 B B B 008H POINT TO SPECIFIC MESSAGE
0 0 0 1 0 B B B 010H GET CURRENT MESSAGE INFOMATION
0 0 0 1 1 B B B 018H DELETE MESSAGE(S)
0 0 1 0 0 B B B 020H REC/PLA Y MISC . FUNCTION
0 0 1 0 1 B B B 028H RECORD MESSAGE
0 0 1 1 0 B B B 030H PLAY MESSAGE
0 0 1 1 1 B B B 038H SKIP FORW ARD/BACKW ARD PLA Y
0 1 0 0 0 B B B 040H MISC. FUNCTION
0 1 0 0 1 B B B 048H TONE GENERA T OR
0 1 0 1 1 B B B 058H MX93000 CODEC MISC. FUNCTION
0 1 1 0 0 B B B 060H LED DISPLAY
0 1 1 0 1 B B B 068H WRITE COMPRESSED V OICE D A TA T O MX93521
0 1 1 1 0 B B B 070H LCD COMMAND
0 1 1 1 1 B B B 078H LCD DAT A
1 0 0 0 0 B B B 080H OUTPUT COUNTER
1 0 0 0 1 B B B 088H Download/Upload Message
1 0 0 1 0 B B B 090H Set Silence level

DR-V4

1 0 0 1 1 B B B 098H Set ROM/RAM wait state
1 0 1 0 0 B B B 0A0H Read/Write RAM
1 0 1 0 1 B B B 0A8H Read ROM

DR-V4

DR-V5

1 0 1 1 x B B B 0BxH Data Bank Functions
1 1 0 0 x B B B 0CxH Data Bank Functions
1 1 0 1 0 B B B 0D0H Data Bank Functions
1 1 1 1 1 B B B 0F8H Play Voice Prompt

DR-V4

BBB:BYTES SEND FOLLOWING THIS COMMAND

DR-V5

DR-V5

DR-V4

DR-V4

DR-V4

MX93521 T O HOST ACKNO WLEDGES (OK Messages)

ACK0: 0A0H, NO D A TA ACCOMPNIED THIS ACKNO WLEDGE
ACK1: 0A1H, 1 DAT A A CCOMPNIED THIS A CKNOWLEDGE
ACK2: 0A2H, 2 DAT A A CCOMPNIED THIS A CKNOWLEDGE
ACK6: 0A6H, 6 DAT A A CCOMPNIED THIS A CKNOWLEDGE

MX93521 TO HOST A CKNOWLEDGES (ERROR Messgaes)

ERR0(0E0H): Command ERROR
ERR1(0E1H): Out of memory , MX93521 cannot perform RECORD function
ERR2(0E2H): No message found, MX93521 cannot perf orm PLA Y function
ERR3(0E3H): No Flash Memory Detected when power on
ERR4(0E4H): MX93521 Busy
ERR5(0E5H): Vocoder Mode , Play b uff er full, data rejected
ERR6(0E6H): No previous or next message found
ERR7(0E7H): MX93000 Command Busy
ERR8(0E8H): No empty block could be allocated for data bank usage

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6.2 MX93521 Power On Initialization Flo w Chart

ST ART

Clear MX93521 internal RAM read

systemsetup serial or parallel?
TP3054 or MX93000, MX93000C?
Flash memory type and initial LCD

MX93521

NO

Flash memory

ID correct?

Is data link in

Flash memory correct?

NO

Is check data link

2nd time?

Format Flash memory &

create data link

Flash memory error

send CMD E3H

MX93521 Normal operation

YES

YES

NO

Flash memory OK send CMD

A1H+xxH

0A1H+000H RESERVED
0A1H+001H SANSUNG KM29N040, KM29W040, KM29N16000 AND KM29W16000 FLASH MEMORY
0A1H+002H SAMSUNG KM29W32000 FLASH MEMORY
0A1H+003H SAMSUNG KM29U64000 FLASH MEMORY
0A1H+004H RESERVED
0A1H+005H RESERVED
0A1H+006H RESERVED
0A1H+007H RESERVED
E3H NO FLASH MEMORY DETECTED

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MX93521

6.3 HOST TO MX93521 COMMAND DESCRIPTIONS
COMMAND 09H

FUNCTION: Move Message Pointer
RETURN: ACK0
RETURN: ERR6, IF REACH THE FIRST OR THE LAST MESSA GE IN THE MEMOR Y

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00001001
DMMMMMMM

IF CURRENT MESSAGE NUMBER IS N,
D=0, JUMP FORW ARD D=1, JUMP BACKW ARD
M=001H, POINT T O THE MESSA GE (N+1) M=001H, POINT T O THE MESSA GE (N-1)
M=002H, POINT T O THE MESSA GE (N+2) M=002H, POINT T O THE MESSA GE (N-2)
M=07FH, POINT T O THE LAST MESSA GE M=07FH, POINT T O THE FIRST MESSAGE

COMMAND 0AH

FUNCTION: Point to specefic message
RETURN: ACK0
RETURN: ERR2, If no such message found in the FLASH memory

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00001010
M M M M M M M M Message Number (High Byte)
M M M M M M M M Message Number (Low Byte)

*The message pointer is point to the last message in the flash memory upon power on.

SAMPLES:

Forward to the next message 09 H 01H
Rewind to the previous message 0 9 H 81H
Forward to the last message 09 H 7FH
Rewind to the the first message 0 9 H FFH
Move Message P ointer to message #258 (102H) 0AH 01 H 02 H

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MX93521

COMMAND 10H

FUNCTION: GET CURRENT MESSAGE INFOMA TION
RETURN: ACK6, DA TA1, DAT A2, D A TA3, DAT A4, D A TA5, DAT A6 or A CK0*

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0001000 0

D ATA1: HIGH BYTE OF CURRENT MESSAGE NUMBER
D ATA2: LOW BYTE OF CURRENT MESSAGE NUMBER
DATA3: USER DAT A #1
DATA4: USER DAT A #2
DATA5: USER DAT A #3
DATA6: USER DAT A #4

*RETURN ACK0 WHEN NO MESSAGE IN THE MEMOR Y
SAMPLES:

GET CURRENT MESSAGE INFOMATION 10 H

COMMAND 11H
COMMAND 12H

COMMAND 13H
COMMAND 14H

FUNCTION: ATTACH USER DA T A TO CURRENT MESSAGE
RETURN: ACK0 or ERR0

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00010BB B

USER DAT A #1
USER DAT A #2
USER DAT A #3
USER DAT A #4

* The USER D ATA is default to 0FFH
* Any data writen with this command will be AND with previous data
* When USER D ATA #1 is 055H. If write data 0AAH to it again, USER DATA #1 will become 0H
* If no message in the FLASH memory , MX93521 will return ERR0

SAMPLES:

A TTACH DATA 12H T O CURRENT MESSAGE 11 H 12H
A TTACH DAT A 12H/34H T O CURRENT MESSAGE 12 H 12 H 34H
A TTACH DAT A 12H/34H/56H T O CURRENT MESSAGE 13H 1 2H 34H 56H
A TTACH DAT A 12H/34H/56H/78H T O CURRENT MESSAGE 14 H 12H 34H 56 H 78 H

COMMAND 18H

FUNCTION: GET TOT AL MESSSAGE NUMBER
RETURN: ACK2, MSG_NO_HI, MSG_NO_LOW

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00 0 1 1 0 0 0

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MX93521

COMMAND 19H

FUNCTION: DELETE MESSAGE(S)
RETURN: ACK0 after deletion completed

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00 0 1 1 0 0 1
DM M M M M M M

IF CURRENT MESSAGE NUMBER IS N
D=0, DELETE FORW ARD
M=000H, DELETE CURRENT MESSAGE ONLY
M=001H, DELETE ONE MESSAGE AFTER MESSAGE #N (MSG #N WILL BE DELETED)
M=002H, DELETE TW O MESSA GES AFTER MESSA GE #N (MSG #N, #N+1 WILL BE DELETED)
M=07FH, DELETE ALL MESSAGES AFTER MESSA GE #N (MSG #N, #N+1,.., #LAST WILL BE DELETED)
D=1, DELETE BACKW ARD
M=001H, DELETE ONE MESSAGE BEFORE MESSAGE #N (MSG #N WILL BE DELETED)
M=002H, DELETE TW O MESSAGES BEFORE MESSA GE #N (MSG #N, #N-1 WILL BE DELETED)
M=07FH, DELETE ALL MESSAGES BEFORE MESSA GE #N (MSG #N, #N-1,.., #1 WILL BE DELETED)

SAMPLES:

DELETE CURRENT MESSAGE 19 H 0 0H
DELETE CURRENT MESSAGE 19 H 0 1H
DELETE CURRENT & NEXT MESSAGE 19 H 0 2 H
DELETE CURRENT & PREVIOUS MESSAGE 1 9 H 8 2H
DELETE ALL MESSAGES AFTER & INCLUDE CURRENT MESSAGE 19H 7FH
DELETE ALL MESSAGES BEFORE & INCLUDE CURRENT MESSAGE 1 9 H FFH

COMMAND 21H

FUNCTION: REC/PLAY MISC FUNCTION
RETURN:

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
00100001
MMMMMMMM

* THIS COMMAND ONL Y V ALID WHEN IN RECORD/PLA Y MODE

M Function Acknowledge Mode
01 H Stop Recording ACK2,CHKSUM_H,CHKSUM_L RE C
01 H Stop Playing ACK0 PLAY
02 H REC/PLA Y P A USE ON/OFF ACK0 REC/PLA Y
04 H T urn on counter display on LCD ACK0 REC/PLA Y
08 H Delete playing message ACK0 PLAY
10H Set REPEAT start point ACK0 PLAY
20 H Set REPEA T end point ACK0 PLAY
40 H Disable REPEA T mode ACK0 PLAY
80H Set Mark ACK0 REC/PLA Y

If HOST send command 21H/04H after REC or PLAY start, MX93521 will automatically display a 5-digit REC or
PLAY counter MM:SS at current LCD cursor. MM is minute. SS is second.

P/N:PM0688

REV. 3.3, APR 07, 2000

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