Table 2. Default Jumper Settings - ZiLOG Z8051 Series User Manual

By default, the Z51F3220 Development Board is set up with preinstalled shunts on J16
jumper pins 1–2 and 5–6 to allow the interfacing of the Z51F3220 MCU's UART0 to the
USB port. When the Board is connected to the USB port of the host PC, LED D5 will be
ON. The default settings and functionalities of these shunts are listed in Table 2.
Headers
J16
J16
J2
J2
As indicated in the table, should you decide to use the the Z51F3220 MCU's UART1
block as the interface for your own project (currently not supported in this release), move
the J16 shunts to positions 3–4 and 7–8.
By default, Input 1 of the ADC is used to measure the supply voltage. This measurement
point is taken from a middle point in the voltage divider circuit that includes resistors R3
and R6; the scaling is performed by software so that the LCD always displays the actual
voltage. For a visual representation, see the schematic diagram in
If a short on the Board should occur, or if its attached component(s) require more than
500 mA, the overcurrent protection functionality will trigger the red LED D6 to illuminate.
In this instance, power to the Board will be terminated, and the USB port of the PC will be
protected from shorting.
Schematic diagrams of the Z51F3220 Development Board are presented
30 of this document.
The physical dimensions of the Board are 4.01" x 2.50" (101.8 mm x 63.5 mm).
UM024303-0312

Table 2. Default Jumper Settings

Pins Functionality
1–2, 5–6 UART0 to USB
3–4, 7–8 UART1 to USB
1–2 V is being measured by AN1
CC
3–4 External V , 2.5 V is used for ADC
REF
Z51F3220 Development Kit
User Manual
Notes
Default
Default
Default
Figure 24 on page 29.
on pages 29 and
Introduction
6