Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 185

• 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

Operation
PS022825-0908
Figure 24. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (1)
OCD Interface
Caution:
The on-chip debugger uses the DBG pin for communication with an external host. This
one-pin interface is a bi-directional, 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 creates an interface from the Z8 Encore! XP
products 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 displayed in
and
Figure
cations (for more details on the pull-up current, see
page 221). For OCD operation at higher data rates or in noisy systems, an external pull-up
resistor is recommended.
RS-232 TX
RS-232 RX
Figure
25. The DBG pin has a internal pull-up resistor which is sufficient for some appli-
For operation of the on-chip debugger, all power pins (V
must be supplied with power, and all ground pins (V
properly grounded. The DBG pin is open-drain and may require an exter-
nal pull-up resistor to ensure proper operation.
25. The recommended method is the buffered implementation displayed in
Transceiver
RS-232
Schottky
Diode
VDD
Electrical Characteristics
Z8 Encore! XP
10 KOhm
SS
DBG Pin
and AV
Product Specification
DD
and AV
SS
®
®
) must be
On-Chip Debugger
F082A Series
F082A Series
Figure 24
on
DD
)
174