ISD25120 Winbond, ISD25120 Datasheet - Page 32

• Manufacturer Part Number: ISD25120
• Description: ISD2560
• Manufacturer: Winbond

In this simplified block diagram of a microcontroller application, the Push-Button Mode and message
cueing are used. The microcontroller is a 16-pin version with enough port pins for buttons, an LED,
and the ISD2500 series device. The software can be written to use three buttons: one each for play
and record, and one for message selection. Because the microcontroller is interpreting the buttons
and commanding the ISD2500 device, software can be written for any function desired in a particular
application.
Note: Winbond does not recommend connecting address lines directly to a microprocessor bus.
Address lines should be externally latched.
FIGURE 6: ISD2560/75/90/120 APPLICATION EXAMPLE – MICROCONTROLLER/ISD2500
OSC1
OSC2
RESET
V
V
IRQ
DD
SS
MC68HC705K1A
U
1
PB0
PB1
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
S1
RECORD
INTERFACE
S2
PLAY
- 32 -
V
CC
S3
MSG#
T
R
BD
1
RUN
D
1
23
24
27
25
22
26
10
1
2
4
5
6
7
8
9
3
A7
P/R
OEM
OVF
A0
A1
A2
A3
A4
A5
A6
A8
A9
CE
PD
XCLK
ISD2560/75/90/120
ISD2560/75/90/120
U
2
ANA OUT
MIC REF
ANA IN
AUX IN
AGC
V
V
V
V
SP+
MIC
SP-
CCD
CCA
SSD
SSA
28
16
12
13
15
11
14
20
21
18
17
19