z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 210

• Manufacturer Part Number: z8f1621
• Description: High Performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS019921-0308
Figure 36. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (1)
Figure 37. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (2)
Caution:
The serial data on the DBG pin is sent using the standard asynchronous data format
defined in RS-232. This pin can interface the Z8 Encore! XP
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
page 196.
RS-232 TX
RS-232 RX
RS-232 TX
RS-232 RX
be supplied with power, and all ground pins (V
grounded. The DBG pin is open-drain and must always be connected to V
through an external pull-up resistor to ensure proper operation.
For operation of the On-Chip Debugger, all power pins (V
Transceiver
Transceiver
RS-232
RS-232
Diode
Open-Drain
Buffer
V
DD
V
SS
DD
and AV
Z8 Encore! XP
10 k
10 k
Ω
®
Ω
SS
DBG Pin
DD
Figure 36
F64XX Series products to
DBG Pin
) must be properly
Product Specification
and AV
®
and
DD
On-Chip Debugger
F64XX Series
) must
Figure 37
DD
on
196