Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 188

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 23
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

PS022825-0908
OCD Serial Errors
The Auto-Baud Detector/Generator is clocked by the system clock. The minimum baud
rate is the system clock frequency divided by 512. For optimal operation with
asynchronous datastreams, the maximum recommended baud rate is the system clock
frequency divided by 8. The maximum possible baud rate for asynchronous datastreams is
the system clock frequency divided by 4, but this theoretical maximum is possible only for
low noise designs with clean signals.
maximum baud rates for sample crystal frequencies.
Table 105. OCD Baud-Rate Limits
If the OCD receives a Serial Break (nine or more continuous bits Low) the Auto-Baud
Detector/Generator resets. Reconfigure the Auto-Baud Detector/Generator by sending
80H
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 four character long Serial Break back to the host, and resets the Auto-Baud
Detector/Generator. A Framing Error or Transmit Collision may be caused by the host
sending a Serial Break to the OCD. Because of the open-drain nature of the interface,
returning a Serial Break 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 F082A Series devices or when recovering from an error. A Serial Break
from the host resets the Auto-Baud Generator/Detector but does not reset the OCD Con-
trol 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
System Clock
Frequency (MHz)
20.0
0.032768 (32 kHz)
1.0
.
•
•
•
Serial Break (a minimum of nine continuous bits Low)
Framing Error (received
Transmit Collision (OCD and host simultaneous transmission detected by the OCD)
Recommended Maximum
Baud Rate (Kbps)
Stop
2500.0
125.0
4.096
Table 105
bit is Low)
DBG
pin when first connecting to the
lists minimum and recommended
Recommended
Standard PC
Baud Rate (bps)
Z8 Encore! XP
1,843,200
115,200
2,400
Product Specification
Minimum Baud
Rate (Kbps)
®
On-Chip Debugger
F082A Series
39
1.95
0.064
177