M I K R O E L E K T R O N I K A S O F T W A R E A N D H A R D W A R E S O L U T I O N S F O R T H E E M B E D D E D W O R L D
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31
1
page
EasyAVR
USB
4
EasyAVR4 User
’
s Manual
MikroElektronika
Development
tools
JJ
TT
AA
GG
CC
OO
NN
NN
EE
CC
TT
OO
RR
JTAG connector can be used as serial programming interface or On-Chip debug system. For
the On-chip Debug system, in addition to the JTAG interface pins, the RESET pin is mon-
itored by the debugger to be able to detect external reset sources. The debugger can also pull
the RESET pin low to reset the whole system. The JTAG interface is accessed through four
of the microcontroller’s pins:
- TMS: Test Mode Select,
- TCK: Test Clock,
- TDI: Test Data In,
- TDO: Test Data Out.
A
TMEGAxxxx
PB1
PB2
PB3
PB4
PD1
PD2
PB5
PB6
PB7
PD4
PD5
PD6
PC1
PC0
PD7
PC2
PC3
PC4
PC5
PC6
PC7
PA7
PA6
PA5
PA4
PA3
PA2
PA0
PA1
PD3
PB0
PD0
RST
VCC
GND
XT2
XT1
AREF
AGND
AVCC
VCC
OSCILLATOR
10K
Reset
100n
VCC
TMS
Vsupply
TCK
TDO
nSRST
nTRST
GND
VTref
HEADER 5x2
CN6
VCC
TDI
GND
JTAG
CONNECTOR
VCC
NC
mRST
mRST
JTAG CONNECTOR
Figure 40.
JTAG connector schematic
