Z8F16800144ZCOG Zilog, Z8F16800144ZCOG Datasheet - Page 304

• Manufacturer Part Number: Z8F16800144ZCOG
• Description: KIT DEV FOR Z8F642 MCU 44 PIN
• Manufacturer: Zilog
• Series: Z8 Encore!®r
• Type: MCUr

Specifications of Z8F16800144ZCOG

• Contents: Hardware, Software and Documentation
• For Use With/related Products: Z8F642
• For Use With: 269-4661 - KIT ACC ETHERNET SMART CABLE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4678

PS025011-1010
OCD Serial Errors
Automatic Reset
The On-Chip Debugger can detect any of the following error conditions on the DBG pin:
•
•
•
When the OCD detects one of these errors, it aborts any command currently in progress,
transmits a Serial Break 4096 system clock cycles long back to the host, and resets the
Auto-Baud Detector/Generator. A Framing Error or Transmit Collision can be caused by
the host sending a Serial Break to the OCD. Because of the open-drain nature of the inter-
face, returning a Serial Break back to the host only extends the length of the Serial Break
if the host releases the Serial Break early.
The host transmits a Serial Break on the
Z8 Encore! XP F1680 Series device or when recovering from an error. A Serial Break
from the host resets the Auto-Baud Generator/Detector but does not reset the OCD
Control register. A Serial Break leaves the device in DEBUG mode if that is the current
mode. The OCD is held in Reset until the end of the Serial Break when the DBG pin
returns High. Because of the open-drain nature of the DBG pin, the host can send a Serial
Break to the OCD even if the OCD is transmitting a character.
The Z8 Encore! XP F1680 Series devices have the capability to switch clock sources dur-
ing operation. If the Auto-Baud is set and the clock source is switched, the Auto-Baud
value becomes invalid. A new Auto-Baud value must be configured with the new clock
frequency.
The oscillator control logic has clock switch detection. If a clock switch is detected and
the Auto-Baud is set, the device will automatically send a Serial Break for 4096 clocks.
Serial Break (a minimum of ten continuous bits Low).
Framing Error (received
Transmit Collision (OCD and host simultaneous transmission detected by the OCD).
Device
Figure 60. Synchronous Operation
DBG
CLOCK
P R E L I M I N A R Y
Stop
bit is Low).
High Speed
Adapter
Host PC
DBG
Any high speed
interface
pin when first connecting to the
Z8 Encore! XP
Product Specification
®
On-Chip Debugger
F1680 Series
290