45111 Datasheet, PDF (13/184 Pages) List of Unclassifed Manufacturers – 14-DAY MONEY BACK GUARANTEE

1 Introduction the SX-Key/Blitz Hardware
1 Introduction to the SX-Key/Blitz Hardware
The SX-Key/Blitz hardware consists of the programmer unit, a four-pin programming interface and a
standard, female serial port connector (DB9). The serial port connector should be plugged into an
available standard, straight-through serial cable on an IBM-compatible PC. The four-pin connector on
the SX-Key/Blitz board should be connected to four pins (VSS, VDD, OSC2 and OSC1) of the SX chip.
Take care to connect it in the right orientation because this connector is not indexed.
Figure 1 - Connecting the SX-Key/Blitz
+5
RTCC 1
VDD 2
n.c. 3
VSS 4
n.c. 5
RA0 6
RA1 7
RA2 8
RA3 9
RB0 10
RB1 11
RB2 12
RB3 13
RB4 14
+5
28 MCLR
27 OSC1
26 OSC2
25 RC7
24 RC6
23 RC5
22 RC4
21 RC3
20 RC2
19 RC1
18 RC0
17 RB7
16 RB6
15 RB5
DB9 serial port
connector
SX-Key or SX-Blitz
programmer device
4-pin programming
interface
Vss
The SX-Key/Blitz is powered by the target circuit’s power supply and programming and debugging
takes place over the oscillator pins. The power supply to the SX-Key/Blitz must be +5 V DC. If an
external crystal, resonator or RC circuit is used, the SX-Key/Blitz can usually remain connected to the
SX chip for programming purposes, without affecting the operation of the circuit. When debugging, the
SX chip must not have an external clock source since the SX-Key’s internal programmable oscillator
must be used. The SX-Blitz can only program SX chips, it cannot debug them.
Each SX microcontroller contains the necessary debugger hooks required to perform SX in-circuit
debugging. No other supporting chips are necessary for the debugging process. During debugging, the
SX-Key provides the oscillator signal to drive the SX microcontroller until such time that a breakpoint is
hit or a single step or stop mode is initiated.
Figure 1 - Connecting the SX-Key/Blitz shows all the connections necessary to program, debug and run
the SX microcontroller. An external resonator or crystal should be connected to the OSC1 and OSC2
pins to run the SX if the SX-Blitz is used, or if the SX-Key’s internal clock oscillator is not used.
SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc. • Page 13