To the right of the RESET button is the six-pin connector for the
SmartCable used to download code into the development board and
control and monitor its operation. Located above the SmartCable
connector is a nine-pin female RS232 serial communication connector. In the upper right corner, you can see the power switch and DC
Located below U5 are three LEDs (red, yellow, and green)
and an on-board prototyping area suitable for interfacing small
circuits. Below the prototyping area is the IrDA-compliant infrared
transceiver. Numerous on-board jumpers enable and disable
portions of the development board hardware, according to the
The Z8 Encore! XP microcontroller comes packed with these
■ 20 MHz eZ8 CPU core, which yields 10 MIPS
■ Enhanced instructions support 12-bit linear addressing of the
Register File for improved performance, including BIT, BSWAP,
BTJ, CPC, LDC, LDCI, LEA, MULT, and SRL
■ Up to 4KB of Flash with in-circuit programming capability
■ Up to 1KB of RAM and 128B of non-volatile data storage
■ Up to eight-channel, 10-bit sigma-delta A/D converter
■ On-chip temperature sensor, analog comparator, and
transimpedance (current sense) amplifier
■ Internal precision oscillator
■ Crystal oscillator with three power settings and external RC
■ Full-duplex nine-bit UART
■ IrDA-compliant infrared encoder/decoders
■ Two 16-bit timers with capture, compare, and PWM capability
■ Watch-dog timer with internal RC oscillator
■ Up to 25 I/O pins depending upon package
■ Up to 18 interrupts with configurable priority
■ On-chip debugger
■ Voltage brown-out protection and Power-On Reset
■ 2. 7-3. 6 volt operating voltage with five volt-tolerant inputs
That is quite a lot of hardware to pack into a microcontroller
package. Figure 2 shows the pin assignments for the eight-pin SOIC
Note that all pins (except for power and ground) have multiple
uses, with their functions determined via the program downloaded into
the Z8 Encore! XP.
After taking a few minutes to install the ZDS II compiler tools and
documentation, I was ready to set up the development system and plug
its USB cable into my computer. The new USB device was detected
and the drivers for the Xtools SmartCable interface were installed.
I turned on power to the development board and the three on-board
LEDs began flashing in sequence (red, yellow, green). Pressing the TEST
button made them flash in the opposite order. So, everything was good
Next, I launched the ZDS II compiler from Xtools and opened a
project for the 4K development board. The project code compiled fine,
but I was not able to download the code into the development board.
In fact, the communication software could not even establish contact
with the development board.
But this was my fault, for I had not yet looked through any of the
documentation on the development board. I located the PDF associated with my development board and read through it. I learned that the
development board has two modes of operation: USER and DEMO.
The board is shipped with all on-board jumpers set up for DEMO mode.
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November 2005 NUTS & VOLTS 81