Z8F082A28100KIT ZILOG [Zilog, Inc.], Z8F082A28100KIT Datasheet - Page 167

• Manufacturer Part Number: Z8F082A28100KIT
• Description: Z8 Encore XP-R F08xA Series with eXtended Peripherals
• Manufacturer: ZILOG [Zilog, Inc.]

Operation
PS024705-0405
OCD Interface
Caution:
Figure 22.Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (1)
The On-Chip Debugger uses the DBG pin for communication with an external host. This
one-pin interface is a bi-directional open-drain interface that transmits and receives data.
Data transmission is half-duplex, in that transmit and receive cannot occur simultaneously.
The serial data on the DBG pin is sent using the standard asynchronous data format
defined in RS-232. This pin creates an interface from the Z8 Encore! XP
products to the serial port of a host PC using minimal external hardware.Two different
methods for connecting the DBG pin to an RS-232 interface are depicted in Figures 22
and 23 . The recommended method is the buffered implementation depicted in Figure 23 .
The DBG pin must always be connected to V
RS-232 TX
RS-232 RX
For operation of the On-Chip Debugger, all power pins (V
must be supplied with power, and all ground pins (V
properly grounded.
The
an external pull-up resistor to insure proper operation.
DBG
pin is open-drain and must always be connected to V
Transceiver
RS-232
P R E L I M I N A R Y
Schottky
Diode
DD
VDD
through an external pull-up resistor.
Z8 Encore! XP
10KOhm
SS
DBG Pin
and AV
Product Specification
DD
SS
and AV
DD
®
®
) must be
On-Chip Debugger
through
F08xA Series
F08xA Series
DD
)
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