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| Z8F1680SH020SG Datasheet, PDF (320/412 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers | |||
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Z8 Encore! XP® F1680 Series
Product Specification
295
23.2. Operation of the On-Chip Debugger Interface
The On-Chip Debugger (OCD) uses the DBG pin for communication with an external
host. This one-pin interface is a bidirectional 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 interfaces the Z8 Encore! XP F1680 Series device
to the serial port of a host PC using minimal external hardware. Figure 56 displays the
connections between the debug connector and the Z8 Encore! microcontroller. Two differ-
ent methods for connecting the DBG pin to an RS-232 interface are depicted in Figures 57
and and 58.
Caution: For operation of the Z8 Encore! XP F1680 Series device, all power pins (VDD and
AVDD) must be supplied with power and all ground pins (VSS and AVSS) must be prop-
erly grounded. The DBG pin should always be connected to VDD through an external
pull-up resistor.ï
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The Serial Smart Cable (SSC) does not work with the F1680 device series because it
does not fully support the silicon OCD. During external clock switching, the OCD sends
a break command to the SSC. This causes the SSC to disconnect from the target and ter-
minate the debug session. You must then reconnect to the target again. Use the Opto-
Isolated USB, USB, or Ethernet Smart Cables when using in conjunction with ZDS II.
PS025015-1212
PRELIMINARY
On-Chip Debugger
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