ADUC814 Analog Devices, ADUC814 Datasheet - Page 63

• Manufacturer Part Number: ADUC814
• Description: Precision Analog Microcontroller: 1.3MIPS 8052 MCU + 8kB Flash + 6-Ch 12-Bit ADC + Dual 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC814

• Mcu Core: 8052
• Mcu Speed (mips): 1.3
• Sram (bytes): 256Bytes
• Gpio Pins: 17
• Adc # Channels: 6

Single-Pin Emulation Mode
Also built into the ADuC814 is a dedicated controller for single-
pin in-circuit emulation (ICE) using standard production
ADuC814 devices. In this mode, emulation access is gained by
connection to a single pin, again the DLOAD pin is used for this
function. As described previously, this pin is either high to
enable entry into serial download and serial debug modes or
low to select normal code execution. To enable single-pin
emulation mode, however, users need to pull the DLOAD pin
high through a 1 kΩ resistor. The emulator then connects to the
EMULATION ACCESS
2-PIN HEADER FOR
(NORMALLY OPEN)
ANALOG
DOWN LOAD/DEBUG
INPUT
(NORMALLY OPEN)
ENABLE JUMPER
1k Ω
10 Ω
1
2
3
4
5
6
7
8
DV
Figure 59. Typical ADuC814 System Connection Diagram
DV
C1+
V1+
C1–
C2+
C2–
V–
T2OUT
R2IN
DD
DD
ADM202
10nF
AV
R1OUT
R2OUT
T1OUT
DD
GND
R1IN
T1IN
T2IN
V
CC
10
12
13
14
11
1
2
3
4
5
6
7
8
9
16
15
14
13
12
10
11
Rev. A | Page 63 of 72
9
DGND
DLOAD
RXD
TXD
RESET
ADC0
AV
AGND
DD
DV
ADuC814
DD
2-pin header. To be compatible with the standard connector
that comes with the single-pin emulator available from
Accutron Limited (www.accutron.com), use a
2-pin 0.1-inch pitch friction lock header from Molex
(www.molex.com) such as their part number 22-27-2021. Be
sure to observe the polarity of this header. When the friction
lock tab is at the right, the ground pin should be the lower of
the two pins (when viewed from the top).
XTAL2
XTAL1
AGND
DAC1
DAC0
DV
C
V
REF
REF
DD
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DV
1
2
3
4
5
6
7
8
9
DD
0.1 µ F
0.1 µ F
0.1 µ F
32.766kHz
DAC0
OUTPUT
V
OUTPUT
REF
DAC1
OUTPUT
ADuC814