Z8F011ASH020EG2156 ZiLOG, Z8F011ASH020EG2156 Datasheet - Page 158

• Manufacturer Part Number: Z8F011ASH020EG2156
• Description: 8-bit Microcontrollers - MCU 1K FLASH 256B RAM 16B NVDS
• Manufacturer: ZiLOG

Specifications of Z8F011ASH020EG2156

• Rohs: yes
• Core: eZ8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 1 KB
• Data Ram Size: 256 B
• On-chip Adc: No
• Package / Case: SOIC-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 2
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

PS025113-1212
Operation
Figure 21. Interfacing the On-Chip Debugger’s DBG Pin with an RS-232 Interface, #1 of 2
Caution:
OCD Interface
The following section describes the operation of the On-Chip Debugging function.
The On-Chip Debugger 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, which means that transmission and data retrieval cannot
occur simultaneously. The serial data on the DBG pin is sent using the standard asynchro-
nous data format defined in RS-232.This pin creates an interface between the Z8 Encore!
F0830 Series products and 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
Figures 21 and 22. The recommended method is the buffered implementation depicted in
Figure 22. The DBG pin must always be connected to V
resistor.
For proper operation of the On-Chip Debugger, all power pins (V
supplied with power and all ground pins (V
DBG pin is open-drain and must always be connected to V
up resistor to ensure proper operation.
RS-232 TX
RS-232 RX
Transceiver
RS-232
Schottky
Diode
SS
and AV
VDD
SS
DD
) must be properly grounded. The
10KΩ
Z8 Encore!
through an external pull-up
DD
DBG Pin
Product Specification
through an external pull-
DD
and AV
®
F0830 Series
DD
Operation
) must be
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