Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 186

• 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
Figure 25. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface (2)
DEBUG Mode
The operating characteristics of the devices in DEBUG mode are:
Entering DEBUG Mode
The operating characteristics of the devices entering DEBUG mode are:
RS-232 TX
RS-232 RX
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Note:
The eZ8 CPU fetch unit stops, idling the eZ8 CPU, unless directed by the OCD to
execute specific instructions.
The system clock operates unless in STOP mode.
All enabled on-chip peripherals operate unless in STOP mode.
Automatically exits HALT mode.
Constantly refreshes the Watchdog Timer, if enabled.
The device enters DEBUG mode after the eZ8 CPU executes a BRK (Breakpoint)
instruction.
If the DBG pin is held Low during the final clock cycle of system reset, the part enters
DEBUG mode immediately (20-/28-pin products only).
Holding the DBG pin Low for an additional 5000 (minimum) clock cycles
after reset (making sure to account for any specified
frequency error if using an internal oscillator) prevents a false
interpretation of an Autobaud sequence (see
Generator
Transceiver
RS-232
on page 176).
Open-Drain
Buffer
VDD
Z8 Encore! XP
10 k
Ω
OCD Auto-Baud Detector/
DBG Pin
Product Specification
®
On-Chip Debugger
F082A Series
175