Z8 Encore!® Motor Control Flash MCUs
Product Specification
242
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 interfaces the Z8FMC16100 Series Flash MCU
device 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 42
and 43 .
For operation of the Z8FMC16100 Series Flash MCU, all power pins (VDD and AVDD
)
Caution:
must be supplied with power, and all ground pins (VSS and AVSS) must be properly
grounded. The DBG pin should always be connected to VDD through an external pull-
up resistor.
VDD
RS-232
Transceiver
10K‰
Diode
RS232 TX
DBG pin
RS232 RX
Figure 42. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (1)
VDD
RS-232
10K‰
Transceiver
Open-Drain
Buffer
RS232 TX
RS232 RX
DBG pin
Figure 43. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (2)
On-Chip Debugger
P R E L I M I N A R Y
PS024604-1005
ZILOG [ ZILOG, INC. ]
