ADUC848BCP8-5 datasheet(91/108 Pages) AD

91 / 108 page

ADuC845/ADuC847/ADuC848

Rev. A | Page 91 of 108

C1+

V+

C1–

C2+

C2–

V–

T2OUT

R2IN

VCC

GND

T1OUT

R1IN

R1OUT

T1IN

T2IN

R2OUT

ADM3202

RS232 INTERFACE*

DVDD

STANDARD D-TYPE

SERIAL COMMS

CONNECTOR TO

PC HOST

*EXTERNAL UART TRANSCEIVER INTEGRATED IN SYSTEM OR AS PART

OF AN EXTERNAL DONGLE AS DESCRIBED IN APPLICATION NOTE uC006.

0.1

µF

0.1

µF

0.1

µF

0.1

µF

RESET ACTIVE HIGH.

(NORMALLY OPEN)

Ω

DVDD

Ω

2-PIN HEADER FOR

EMULATION ACCESS

(NORMALLY OPEN)

DOWNLOAD/DEBUG

ENABLE JUMPER

(NORMALLY OPEN)

32.768kHz

DVDD

AVDD

AGND

REFIN–

REFIN+

P1.0/AIN1

P1.1/AIN2

P1.6/IEXC1/AIN7

200mA/400mA

EXCITATION

CURRENT

RTD

RREF

5.6kV

XTAL2

XTAL1

ADuC845/ADuC847/ADuC848

CSP PACKAGE

17 18 19 22 36 51

37 38 50

0.1

µF

Figure 69. UART Connectivity in Typical System

In addition to the basic UART connections, users also need a

way to trigger the chip into download mode. This is accomplished

via a 1 kΩ pull-down resistor that can be jumpered onto the

PSEN pin, as shown in Figure 69. To get the parts into download

mode, connect this jumper and power-cycle the device (or

manually reset the device, if a manual reset button is available),

and it is ready to receive a new program serially. With the

jumper removed, the device powers on in normal mode (and

runs the program) whenever power is cycled or RESET is

toggled. Note that PSEN is normally an output and that it is

sampled as an input only on the falling edge of RESET, that is, at

power-on or upon an external manual reset. Note also that if

any external circuitry unintentionally pulls PSEN low during

power-on or reset events, it could cause the chip to enter

download mode and fail to begin user code execution. To

prevent this, ensure that no external signals are capable of

pulling the PSEN pin low, except for the external PSEN jumper

itself or the method of download entry in use during a reset or

power-cycle condition.

Embedded Serial Port Debugger

From a hardware perspective, entry to serial port debug mode is

identical to the serial download entry sequence described

previously. In fact, both serial download and serial port debug

modes are essentially one mode of operation used in two

different ways.

Note that the serial port debugger is fully contained on the

device, unlike ROM monitor type debuggers, and, therefore, no

external memory is needed to enable in-system debug sessions.

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