Getting Started
T8xC5121 Starter Kit User Guide
2-5
4186E–SCR–05/04
2.5
Hardware
Connection
1.
A 9 - 12V power supply must be connected to the J3 connector.
2.
A serial cable must first be attached between COM PC port and J2 DB9 connec-
tor of the demonstration board.
3.
Ensure the T89C5121 or the T85C5121 microcontroller is connected to the
board.
4.
The ON/OFF Switch (SW3) must be ON. See Figure 3-1.
The Board is delivered with one 14.7456 MHz quartz (Y2).
2.6
Power Supply
2.6.1
Board Supply
The Board can be powered from:
“9V DC IN” J3 Power connector
“9V DC IN” JR1 connector for battery connection
“3 - 5V DC IN” JH2 connector connected to V
CC
/V
SS
Signals
RS-232 Connector using Pin 9 and JP3 Connector
In the first two configurations the potentiometer R23 is used to adjust the V
CC
level.
In the last two configurations V
CC
is directly connected to the board.
Table 2-1 outlines the isolated Power Supply control for the demonstration board and
microcontroller.
Table 2-1. Power Supply Control Settings
2.6.2
Internal Voltages
Three test points are provided to monitor the internal voltages.
Table 2-2. Test Points Table
Reference
Designation
Switch On/Off
Test Point
Jumpers
Vcc
Board Power Supply
SW3
TP11
JP1
Vcc
Microcontroller Power Supply
JP17
Reference
Designation
Test Point
DVCC
Core regulated voltage (3V)
TP14
EVCC
UART power supply
TP10
CVCC
Smart Card Supply
TP2
